Yeh Mr Vegas is alright- as Mr.PlanetEater said: 'smooth', calm. I can imagine an old Sinatra-like guy sitting next to a fire in a comfy chair, with a nice big glass of Scotch & chatting down a microphone. He suits the Mojave a lot more than Three Dog would.
I LOVE 3Dog, miss him loads in New Vegas, but he fits DC too much- the chaos, the action, the good fight. In DC (FO:3), the fight is the ultimate powerstruggle over control for DC and the East, it is an actual, evolving, living fight.
In FO:NV, it's a much more chilled game from the off.
Oh but I do miss him, and the music. I am getting into Mojave & New Vegas radio, but not as much as GNR