In my opinion you are not wrong. They did Magneto well in this one, i would like to have shrapnel sentry do more dmg without any other char helping but it's good enough and his brutal defence is almost to great.
Perhaps i would have enjoyed MUA more if i had live, it felt so empty without Magneto, and Dr. Doom would also have been great to play with.
MUA2 had Hulk without any dlc so that was awesome.
I feel like the concepts of good and evil staggers my inner hatred to leak out in it's purest chaotic/destructive form.