I've been the PvP route - two characters to 60 near to release, then another to 70 after TBC. Now all my characters go PvE. If I want to PvP, there's a battleground 2 minutes away. Otherwise I just want to do my own thing without being ganked by whatever bunch of the opposing faction happen by, or by whatever class happens to be flavour of the month. Rock, paper, scissors, yawn.