I'm a Fallout 3 fan. Once you go V.A.T.S., you can't go B.A.C.K
But the world felt more, helpful and enticing. The exploring of modern ruins was better than running around a field. I'd played Morrowind once, I tried to find my way through a swamp, that was no fun at all, and starting Oblivion I sorta enjoyed it, but didn't like what it gave me.
I could depend on which you play first, or what, but F3 gave me a better journey, so much that I'm still playing it again, and I haven't even gotten the DLC on it yet, and I'm considering saving up so I can afford pre-ordering F:NV because I liked what F3 gave me as a player and as an experience