Aight guys I have done a lot of critiques by now so I think its time to throw my hat into the ring:
My recent set vs. Wenz
Other than Samus, Doc seems to be my worst matchup. I've been trying to play with Boss and Wenz, the two best Docs in my region, but I am still very confused on what I am supposed to do, especially without platforms. I've got a bunch of self-critique (particularly on my combos/followups) but I thought I'd let you guys handle that.
I fight doc a lot.
Basically throw out any pre-conceived notions or myths about doc and this matchup.
Myth #1: Doc's recovery sucks.
Doc's recovery does suck in a sense, as in, if he misses a DI he's probably dead or in big trouble. However, good players don't miss recovery DI very often, and especially against Marth who doesn't make people miss recovery DI very often, he'll be DIing fine and the fact is if he DIs well he has fantastic recovery tools.
For this reason you should might want to stop fsmashing/dtilting the ledge. You're just lagging in front of him and a waveland with invince frames is coming. If you are actually going to attempt to edgeguard doc, you need to take the ledge from him, and if you don't have time to do that you need to just prepare yourself as well as possible for the inevitable waveland he's bringing. Doc's most often will waveland into shield, wait for you to do something, then respond with a roll or a sidestep. If you're really confident he'll do this you can just grab here but the safer play is to just dtilt the shield and react to what he does. Just try to maintain control here and LOOK FOR GRABS. You don't grab very much and grabbing ***** Doc.
Myth #2: Just wall Doc he can't possibly get in.
You already seem to be seeing this as you're not really spending too much time spamming moves in front of him. You should try to cut this down to not spamming ANY moves in front of him. Doc's WD oos jab is a nasty approach and will punish a lagging Marth. Basically, Doc can get in, but he's probably going to do a lot of shielding to do this. This is when you need to find grab opportunities. His sidestep is annoying, so you can't telegraph the grab attempt too badly, but watch his patterns in and out of shield and usually the best time to pounce for a grab is the exact moment he likes to begin shielding.
Myth #3: Don't try to grab Doc.
Grab is enormous in this matchup imo. When you're not that experienced in it your grabs will be telegraphed and he'll sidestep and **** you. You just have to find better spots to grab. Once you grab, you should mix up your throws. You seem to be back throwing a lot, which is not bad but not my personal preference. If I'm near the ledge I'll dthrow him off and try to mindgame him with stealing the ledge and what not. Generally speaking, I like to up throw Doc. He's terrible at getting himself back down. He's miserable at challenging you in the air with anything other than his dair. Which means once you have Doc above you, you should be doing absolutely nothing except looking for that dair (cause it's definitely coming). You seem to rush up into the air to challenge doc and he just FF dairs through you, completely flipping the momentum. Try to fight that fight closer to the ground (but still in the air). Protect yourself by just hovering in a short hop under a platform. Sometimes just empty hop and drop back down into an up tilt. The big thing is, don't commit so early in the air against doc because you have him over a barrel. If you ever steal his double jump ala vs sheik, you won't see any character die so fast in this game.
I think you're doing a decent job of getting Doc uncomfortable/out of position, but then you're a bit impatient when it comes to actually taking advantage of that. I actually prefer FD to most stages vs Doc because the lack of platforms makes it horrible for him to get back down on the ground. The fact that he's kind of floating in front of a guy with a huge sword is going to force him to want to do SOMETHING. Whether it's an air dodge, cape, or dair just be patient and maintain control. Even if all you get out of it is another grab, just keep it going. Force him to come back down again. You want to fight doc in the air. He wants to fight you on the ground where he can shield and cc and dsmash. If you start hitting him in the air intead of GETTING hit by his dair every time, you'll probably swing your matches 2 stocks.
Couple other random things:
Pills - You're doing a lot of jumping over pills and fairing pills. Doc wants you to get uncomfortable/out of position here, so don't do this. Just jab pills. Unless he pills from extremely far away, he can't actually catch up to the pill in time to punish you jabbing the pill and then reacting to his approach. When doc pill spams me I jab and walk towards him between pills. He'll feel the pressure eventually.
Recovery - Vs Doc is one of the rare matchups I feel like high recovery is actually better. Too many bair tricks, not to mention the cape, makes low recovery pretty dangerous here. He actually gimps you better than you gimp him. By quite a bit imo. Recover high and watch out for bairs always. Don't do any wreckless side B's hovering above the edge of the stage.
IMPORTANT: Your Fair game - Spacing fairs and mixing up your fairs is the key to this matchup imo. While you can't truly wall him, spacing fairs really well is very hard for him to beat. You'll notice when space fair on this doc's shield, he likes to roll behind you. Fair his shield and just wait for something and react. You also should mix in early fairs and mid-shorthop fairs. By changing up your fair timings it will really confuse him as far as his shield and OOS timing, which will then net you grabs later on. You don't want to be lunging really far at him with early fairs obviously, but if your spacing is already there, early fair in place/retreating early fair on shield is a great mix up. Once you actually land a fair it's just about reaction to follow up with more fairs. If you don't react in time, pull back. Don't go for the direct follow up if you don't think you reacted in time, and instead play the waiting game underneath him. Wait for a mistake or something to capitalize and punish further that way. I think sometimes you're starting your short hop fairs from too far away, then they end up coming up short, and he just punishes the lag. Work on keeping yourself in a specific range against doc and then w.hore out fair when it's actually threatening him.