@Thanee
Yes, Co-op is great! There are 4 difficulty setting, Easy - Normal - Advanced - Expert (actually there is a fifth, but it's special and called Versus and used only in the versus game mode).
If you want a pick me up and just KILL ZOMBIES to let off steam Normal and Easy are a great way to relax (for me at least) and just do crazy stuff and not be punished (aka: be killed) for having fun and being silly.
With a group of players focusing and using their mics/trying to communicate, Advanced will be a fun challenge but beatable. It's the difficulty I play most when I do coop to hone my skills further.
Expert... well another thing with the game is friendly fire is a pretty common occurrence since the survivors (the humans) are often bunched up shooting zombies at close range around each other. You really shouldn't be doing it if you can avoid it obviously and on expert friendly fire does full weapon damage to team mates. On the other difficulties, friendly fire only does a fraction of normal weapon damage to fellow survivors.
So Expert is HARD. But fun! You really need to be on your A Game to play Expert and have some good friends to play with. I have yet to beat a full mission on Expert. Each mission is a series of 'acts' or 'scenes' I suppose you could call them and each one has 5 of them, the last being a 'finale'.
As for Fallout 3? It was just disappointment for me... I guess we can keep it at that cause if you want me to really get into it here, I think you'll find my reasons are purely my own opinion/taste and may not make any coherent sense to others who do/did genuinely enjoy the game.
I never got a chance to play Oblivion. When it was released my computer was much to old/slow to run it, and by the time I did get a new computer that could reasonably handle it, Oblivion was old hat...
