Just played some games as Samus since I barely used her at all since getting the game, to get a better idea on why she's so bad for myself. First off, the good:
-I like her mobility, much better than before. She moves more fluidly and follows up better.
-Her tilts are all more useful and faster, even if dtilt is much weaker.
-Charge Shot is great when it actually connects.
-She definitely kills a little easier than before.
-Great grab and excellent pummel. Throws have some follow ups like fair or uair.
The bad:
-USmash is asinine. Why can't it hit next to her AT ALL? Even tall characters like Link avoid it. She literally has to juggle to connect this thing.
-Bair and Uair are TOO WEAK. There is no reason Samus should have less kill power with these moves than Sheik, who is supposed to be fast, combo-friendly and weak. Bair literally can't kill even at the stage edge until well above 100%.
-Missiles suck. Too slow for how ineffective they are in knockback. Smash missiles need to kill way earlier.
-Uair and fair need the Sheik/Fox treatment of trapping the opponent in their gravity to ensure the final blow connects.
-Jab hits are terrible at both connecting.
-Dair is too slow on startup, easy to hell to avoid.
-Dash attack has awkward startup frames that make it possible to lunge through an opponent before using the shoulder bash, even though Ganon and Falcon don't have that issue.
-Side-smash should have a bit more power on sourspot.
-Down-smash is horrendous. No damage OR knockback. Not that great in speed either.
There's a lot of issues that need to be worked out here.
I agree with many of your points. Her tilts are great, usmash is garbage, but utilt makes up for it by being harder to punish and stronger (why?). Usmash basically only hits super tall characters. At least it includes rosalina. Utilt nets me lots of kills against people coming back to the stage.
Her fsmash is pretty good in this game. It's tied for fastest (frame 10). And has good knockout power. Very fast and the sweet spot kills around 100%. Can be tilted to great effect as an anti-aerial and as an edge punish. I could hope for a better sour spot though.
Missiles could be better but the objective is to use them then follow them up. They are a very safe move to force a person off a ledge from a distance. Super missile chains to charge shot at low percent, chains to a sh charge shot at mid percent, and almost chains to a full jump charge shot around 80% (this one seems avoidable). I do wish it was more like melee's.
Jabs are terrible. Jab 1 isn't safe until about 30%.
Dash attack is great. It does have the janky startup, but once you get used to it, the dash works well because you can cross up a shield while still hitting an opponent and it's hard to punish. It also chains to Uair like a boss.
Uair is a chain move. I'm fine with how weak it is. Frame 5 startup, bigger hitbox than brawl, very little landing lag. Uair is great. Basically the same story with fair, frame 6 startup and a great gimp move.
Bair has 3 hit boxes. Sour, strong, and late. The strong hitbox isn't really that small at all. It's significantly stronger than sheiks.
Dair is as telegraphed as Mario's fair but at least it has low landing lag.
Unmentioned Pros:
Heavy (7th heaviest) and floaty (tied 6th slowest faller) (only character like this) this makes her hard to kill and lets her escapes combos relatively well. For me, this is one of the biggest reasons I like her.
UpB is super buffed. It's a legit kill move especially if you catch them up high. Great OoS option and has invincibility frames.
Good recovery mixups thanks to bombs.
The pummel thing can't be overstated. It's not only good for building damage, it uses lots of hits to do so and will freshen up your moves a lot.
Unmentioned Con:
Grab startup is slowest in the game (tied ZSS), reducing shield grab options in comparison to the majority of the cast, and even compared to link, tink, pac-man and to a lesser extent, yoshi.