Technically excellent compilation of two arcade games from Marvel's "Vs" series of cross-universe fighting games: Marvel Super Heroes and Marvel vs. Capcom.
The joystick response and audio-video quality achieved here by Iron Galaxy are absolutely top-notch. They also added in various collecting and challenge goals, I think, and also online play?--but those aren't really things I'm into.
Single-player gameplay-wise, what you've got is pretty much Arcade mode. I'm not fond of the gem mechanic in MSH, or Iron Man's "Repulsor Blast," and MvC is where the series started to get into a huge emphasis on super meter spam and giant combos, which aren't my thing so much. But for those who do like these original arcade games, you'll be hard-pressed to find a better console version.
Dang well I don't think I'll really be able to play Marvel Super Heroes anymore--and it's the last real 1-v-1 game they made in the series, after X:Men COTA which was a bit crude--because I found that when any character other than Spider-Man, Wolverine, Psylocke, and possibly Thanos scores a hit while having an activated Power gem, the screen flashes red. ; P I had to go back and edit out 29 Power gem activations from this darn video I just made: