I'm not sure if you've played these two games or if it can be played on PC, but I want your opinion on the two. Personally I think Guerilla (the older game) was much better, for it's open, sandbox environment. Armageddon on the other hand, had a bullshit, epic-shooter storyline, like CoD, or Metro 2033, now I'm not saying Metro 2033 was a bad game, I loved it, but I would also love a multiplayer to Metro, in which I heard will be there in Last Light . anyways, it really took away from the game, I didn't want to play the story fourty times over holding a tiny Pony that shoots rainbow laserbeams out of it's ass that disintegrates everything. (that's an actual cheat-mode gun, a variation of another disintegrating rifle) The multiplayer was good, but boring. On that note, I just picked up RF: Guerilla for 10 bucks at EBGames, which is awesome, because I've never actually bought the two of the games mentioned in the title, only rented.
I liked Guerrilla better, but then again, those 2 games are totally different and will appeal to certain crowd. Armageddon was good though. Loved that Magnetic gun