I'm really tired and not in the mood to multi-quote, sorry.
Ok, so its pretty obvious that SL > DS, since you keep bringing dancing blade up for everything.
Not really, they're situationally better then each other. But Marth has dancing blade too, which gives him an overall better OOS game, because basically every situation you'd want to use SL over dancing blade, dancing blade is as good or better.
I'm honestly pretty darn sure Marth shouldn't be using DS OoS at low percents. All the other character needs to do it airdodge and run up and Usmash or something. Or grab.
Again, DS is for when the opponent is committed, you don't actually use it until the opponent hits your shield OOS.
Come on, you don't seriously shield-drop and do OOS counter options until your opponent actually hits you shield, right?
And some of your points are contradicting each other.
You said DS was an OoS killer and that Marth should be getting a lot of his kills OoS.
Ok.
Then if you're using it so much, wouldn't it be degenerated? How are you going to kill with that?
If you say "just substitute DB instead", what if Marth isn't in the position to use DB? Thats what the opponents going to take advantage of.
Firstly, understand that the reason that DB and DS are great together is most of the time, you don't have to worry about only having one option, you can usually choose whichever suits you.
Dancing blade's hitbox is a frame faster technically (you gotta shield-drop first), but Dolphin slash has the 4 frames of invincibility.
So, until you hit killing percents, except for the "dolphin slash only situations" (aka, jab combos, Falco chaingrab, etc.) use dancing blade.
As for stale moves, dancing blade is amazing at dealing with that, each hit counts as a seperate move as far as staling is concerned, which means 2 dancing blades and you're up to almost fresh even if you hit 9 times in a row with DS. It makes it very easy for Marths to ignore stale moves, because it doesn't effect us much.
Situations mean a lot. The game is just a bunch of situations, much like how life is just a bunch of events.
You could say that OVERALL, Marth would be better since he has more options, but if you just exploit the way you attack his shield and limit his options to mainly DS if you think you might take the hit, whats he going to do with DB?
MK just covers all the grounds as having the best "all around" attack OoS.
Players can just take advantage of Marth's OoS and make him use DS to punish every time.
No, because there are plenty of situations that SL isn't equipped to handle. Functionally, shuttle loop is like dancing blade as far as options go, but weaker because it lacks the versatility of response, and the resistance it carries to stale moves.
How do you plan on limiting the responses to just things that Marth can respond to with Dolphin slash that he can't actually respond with it? As a rule, they're attacks that require commitment, because the attributes that make dolphin slash ideal is it's abilities to prevent combos/chaingrabs and hit through multi-hit moves due to the invincibility frames. When it comes to combos, you already need to pierce Marth's defense. As for multi-hit moves, you're already committed, he will Dolphin slash you, often even if you manage to hit him (jab combos).
For all other situations, he will use whatever suits him, usually dancing blade until you reach kill percents, and then Dolphin slash.
If they're not going to tournaments, what are they doing talking about MK on smashboards? =/
What are you doing taking them seriously for taking about MK on smashboards?
Even if you still think I'm wrong about addressing their posts:
"I suggest you learn to actually play MK then, cause that'll just get you ripped to shreds."
If you were a noob, would you take that as "correcting"? I wouldn't.
It doesn't help them understand whats wrong at all. It just makes you seem like a jerk.
Something along the lines of "If you're being serious, I would go watch videos of some high-level MKs before making a conclusion like that." would be better.
Because they might be future tournament-goers, plus they're part of the community, and when given the right stimulous could be valuable members.
That said, when people make comments like that, they assume it's ommon knowledge, therefore challenging it helps break that impression, even if it's only one line.