Like a few of the people in here, Prime was my first taste in the series and I didn't get into other games until after I had beaten it. I've played the first one, but never beaten it, however I did beat Zero Mission. I'm contemplating getting Other M, but I'm still not entirely sure I want to see the series take that turn.

Also, although I love the Prime series, I think that Corruption sealed it off. Maybe another strain of games in the same FPS style will emerge, possibly Dread?