Free-roaming is better than the missions.
Graphics are great with an HDMI cable.
Missions where you have to protect Rick from getting hurt or keep a building from being destroyed are the most annoying.
A few quirks - go to the sunken outdoor ice-skating rink with the gold statue in Rockefeller Center & stand in the NW corner; none of the enemies can touch you, not even the Hulkbuster & your threat level goes all the way back down to zero. Also, if you just run in a circle none of the enemies can target you & your threat level drops back down.
Bi-Beast comes up in free-roaming if you stay in the Ceres Sector long enough, and the up-graded Kyklops appears the same way if you stay in the Vulcan Sector long enough.