so ive been playing this a while now.
Level 18 and just entering Vegas for the first time
game isnt a huge leap forward from 3, gfx very similar, more weapons, more baddie types, its harder than 3, no more perk every level (every 2) and lots of choices of factions to side with.
BOS, NCR, Legion, FOA and more.
Im liking it.
be warned though it has some game crippling bugs, nearly lost my game to Boone (ex NCR sniper) deciding to open fire on NCr troops for no reason even though he gets pissed off if you kill them