In Oblivion I was an assassin through-and-through, I could snipe anyone at any range so long as I had a general idea of where they were and there weren't obstacles on my trajectory xD I did work on my magic side a little so I could get some enchanting done too, resulting in me firing high strength bows with elements as high as 15 Fire, Ice and Lightning, xD ultimate killers against just about EVERYTHING. Add the multiplier of sneak killing a target and nothing would survive.
For Fallout it was sort of similar, but I mixed in close quarters combat specializations (such as powering up my small-arms, and melee) I'd sneak as much as I could then if I was detected I'd rush in with Grim Reapers sprint and a shotgun for blowing enemy skulls apart, xD few things survive my swift wrath... Except Super Mutant Overlords, Albino Radscorpions and REAVERS, freakin.. stupid... nasty.. THINGS