I got halfway through Fallout 3 and got bored and gave up. The story is slow and not very engaging, the combat is boring and awkward, gameplay is repetitive, and your character ends up pretty much the same regardless of what skills you go for. It looks pretty, but it's a wasteland so it all kinda looks the same. It has some neat stuff, but overall I think it was pretty over-hyped and I regret buying it (at least for the $50 I paid for it)
Dragon Age had me addicted from start to finish, and I'll probably start over real soon. It looks great, the voice acting is top notch, the combat is fun and allows for a few different playing styles. It's got a great story, and even most of the side quests were somehow tied into the main quest so it felt less arbitrary.