Can´t fully enjoy NV like F3

When I played Fallout 3 I really liked it and I think it's one of my favourite games, but when I started playing NV I don't seem to quite enjoy it as much, I played a good while but never really enjoying it as I remembered F3 and now (after like a year without playing) I made a new game in NV but can't really immerse myself like in F3.

Anybody has a similiar sensation? Just me? Would F4 like me more?