Inversion: Fun third person shooter, with polished visuals, but a little unbalanced here and there. The gravity gameplay isn't really necessary at the beginning, but becomes more useful and important as you go on. Too many cut-scenes at the beginning, and too many boss battles piled in at the end. Fairly console style of game, but a good port to the PC with good mouse/kb controls. Having your NPC partner playing with you lifts the game to a higher level, and there's even a pretty decent background story.
Prototype 2: While this does seem to be better in every way than the original, it has a game killing mouse control that gives me a headache very quickly (not something I usually get on third-person games). This uses console/controller style acceleration that depends on how far you move, rather than PC-style how fast you move. It means you're constantly adjusting to get your character to go the way you want, so it's like driving a car with loose steering. It's a real shame given that they've given you a massive city to superhero around in.
As Activision has closed down Radical Entertainment due to poor sales of the console versions, don't expect any fixes for the poor mouse control, or the memory leak that bring games to a shuddering halt every hour.