Freedom Force 2
Freedom Force was a great tactical superhero game - the reasons it didn’t get a lot more playing time on my computer were a couple of flaws that I felt were unforgivable; despite a FANTASTIC system for creating your own custom superheroes, you could not use those custom heroes as the main characters throughout the single-player campaign. As much as I loved the kitchy Golden Age plot, I just didn’t have fun with the game’s pre-fab heroes. The other thing that killed replayability for me was that multiplayer was very weak, consisting of a single, basic head-to-head mode.
I don’t know about using custom heroes as main characters in the single-player campaign yet, but multiplayer is reportedly an area of focus for the Freedom Force sequel, Freedom Force vs. The Third Reich - including a co-op mode which should be enormous fun.
Want to get an advance look at the game? Download the demo of Freedom Force vs. The Third Reich.
(No, seriously, go download it.)