Fallout 3

Duff's Pros:

The FatBoy mini-nuke gun is just bad ass. Also, the quick-travel between discovered cities. Searching for loot is rewarding and there is plenty of it. VATS really helps deconstruct enemies in a pleasing manner. The character upgrade system seems to be a bit more understandable then its oblivion predecessor. And yes, the environment, the atmosphere, and the soundtrack are all bloody brilliant.

Duff's Cons:

Vicious Dogs. Fire ants. My game has frozen twice. VATS sometimes doesn't work, and will almost lock up my game. The hunting rifle never hits anything. I never have very much health. Sneaking sucks alot like it did in Oblivion. I always have to eat/drink items that give me 10hp in return for 5 radiation. A ton of walking. The pip boy map/quest function is barely cuttin it.

CementShoes' Pros:
-I found the VATS to work very well. When used in conjunction with your most proficient weapons/skills , it adds a depth to the game that you can capitalize on.

-The character building has a comfortable impact on the game. (I for one didn't really enjoy the parallel leveling of everything in Oblivion.)

-Absolutely loved all the loot that you pick up throughout. It really encourages exploration when you can find excellent items that aid you throughout.

CementShoes' Cons:
-The navigation and quest system leaves you wanting more direction. When I went on one quest to find a group of punks terrorizing a village I arrived at the destination on the map, but was not given a further objective.

-Negative Karma when stealing I don't want there to be some strange forces or god taking into account my every action, EVEN WHEN FULLY HIDDEN!