I enjoyed Red Faction, actually. Multiplayer was fun when people weren't cheating. It was always fun to play a capture the flag w/ RF and just blow your way thru the walls to the the enemies flag. The maps they had were sweet also. Geo-mod ownz. That was the coolest feature. Also the vehicles were pretty tight, too.
The only thing that Red Faction didn't live up to was the AI. You supposedly could "sneak" around and not have to kill everyone, but there were times that the AI just KNEW you were there. W/out even poking your head out they were already firing down the hallway or room. Once they've find you and you were in a firefight, they didn't move too bad using cover, fleeing, strafing.
Also, the difficulty settings sucked. If you increased the difficulty it would come to a point where the AI didn't get better (in the sense of using environment for cover, strafing, etc), but rather they would cheat. They suddenly would move so fast that they're legs stopped moving, making them look like they were sliding or flying. Accuracy for them would go up 1000% and they were almost always head shots (a headshot in RF meant instant death).
It was short, too. I remember complaining that I had finished the game in too little time.
I didn't like the previews of RF2 so I didn't buy it. A friend rented it for the PS2 and he said it was fun, but short.