Definitely. Although if I'm honest, I certainly feel I could've had an easier time doing Doom's 9 on pad, hitting L and A2 at the same time is just not comfortable x____x
Also, if the combo doesn't require X-factor, try activating it before the combo, it might make it easier (Chun's 10, Doom's 9, etc.)
The missions in this game are not bad on the whole. There are some tricky ones, but they can all be done with a little effort. I mean, they're certainly easier than the missions in SSFIV and BBCS.
Much, much easier. In SSFIV and BBCS my execution and the difficulty of the combos prevents me from ever finishing them, in Marvel the only thing between me and a complete set of missions is a few hours.
Oh, and DLC is coming on March 1st, Shadow mode for free and the first set of costumes for 400msp/$5.