It'll take more than a team of heroes, it'll take an alliance...
After the Alpha, the team moves to Stark Tower, where the team expands further with Iron Man among other heroes. There are X-Men in the design of their Legends counterparts such as Wolverine, Iceman, and Storm. The Fantastic Four, Elektra, Spider-man, Spider woman, and more also come along for the journey. Most of them I knew of from the comics or films based on the comics, but some were new to me.
It felt easier then the Legends series, but then after playing 40 plus hours between the two, any game based on their principle design would seem less difficult. Further bonus heroes such as Daredevil, Blade, Black Panther, and the incorporation of Silver Surfer if you manage to beat all the comic missions was a nice touch.
The enemies were not difficult opponents aside from the puzzle based methods to defeat some of them like Mandarin and Loki. The shared enemy of Daredevil and Elektra, Bullseye felt like a pushover. Scorpion was a waste and Rhino was easy compared to their counterparts in the recent Spiderman games. The same principle applies to anyone fought using the Fantastic Four compared to their so-called team game enemies.
I suppose for consistency Raven has always managed to produce a nearly balanced format for team games and single player games too.