You're good at laying down traps with Dormammu, and it makes appproaching him a bit difficult, but when I did get close, I noticed he was fairly easy to beat around. I understand he's more of a ranged punish type of character, but you should look into improving your point-blank combos with him a little more.
For just picking up Super-Skrull, you're pretty good with him. The only fault I really saw is that you tended to use his ranged grab a lot, and that would leave you open to punishment.
She-Hulk is solid all-around. I can't really think of any outstanding criticisms.
Wesker has some pretty ridiculous combos if you take advantage of his OTG magnum shot. You should look into that.
Phoenix and X-23 have been on my team since day one. Deadpool is fairly recent. I've been using him for about two weeks and still haven't bothered trying his or X-23's missions. I should probably get on that. Before Deadpool, I was using Wolverine. After seeing what he can do in ranked matches, I think I might give him another shot if Deadpool doesn't work out.
I try to use Phoenix on point occasionally because she's my best character, and to defy the whole "Phoenix players only keep her on reserve" stereotype that's been getting me a lot of hate mail. Even with her low stamina, I think she's a lot more useful than people realize. For example, if you use air traps against Sentinel to prevent him from approaching, and take advantage of her teleport abilities to neuter his laser spam, she stands a good chance at taking him out. If Sentinel so much as touches her, she's guaranteed dead, but healing field might save her. I'd have to test it out.
On a less constructive note, those games were surprisingly lag-free, given the geographical distance between us. I'm impressed.