I played Red Faction 2 and thought it was a pretty darned good game overall. It's been a long time though so I can't really remember too much about it other than that the level design was pretty cool and the combat kept me interested.

I loved Red Faction Guerrilla. Really got into the atmosphere and the way you could approach every mission with many different strategies - go in guns blazing; use the jetpack to get on top of a hill and snipe from there; drive a huge truck into the enemy base and crush everything; use that thermobaric rocket launcher to take out an entire building in a couple shots. And the big battles towards the end of the game where you got to drive a mech or a futuristic tank or other armored vehicles and blast everything to smithereens- that put a huge grin on my face :D

Red Faction Armageddon, oh I don't know. I played it for a few hours and put it back on the shelf. It didn't seem too terribly bad, I was just bummed out that they removed the whole open world aspect of the game, which was my favorite part. I'm meaning to go back and finish it some day.