Who told you that Red Faction Guerrilla is terrible? The game is solid and a lot of fun. It has a few minor flaws, but overall it's a fantastic game. It's got an 85 on Metacritic, with an an 8.3 user rating. Both critics and gamers liked RFG.
EDIT: It's a little light on plot, but the voice acting is pretty good and the story does hold up well enough to advance the gameplay. There are a variety of missions and the weapons are a ton of fun to use. The controls are pretty tight. The graphics are decent, if not spectacular. There's nothing fundamentally broken about the game, and quite a few things that really stand out.