Okay, hold onto your butts... here we have an MMO that's fun from level 1!
One of the best points of Warhammer is the auto-levelling system. Whenever you enter RvR, your stats (not your abilities, just your stats) are automatically advanced to a level or two below cap for that RvR zone. So at level 1, if you get bored with quests (or even right at sign-on), you can enter an RvR scenario (as I did) and still get a chance to place in the top 10 for damage. It's fun from day one. No "rush to the endgame, where the fun starts" here.
True, the PvE element (when held on its own) is weaker than some would like (WTFOMG no raidzlol?!?!?!) but if people would give the RvR system a chance, I think many would come to realise that not all PvP engines are created equal. RvR is not a gank-fest. RvR is a battle. Yes, you die... but unlike some other MMOs, death is actually kinda FUN in War. It's less of a "dammit, now I've gotta run ALL THE WAY BACK..." and more of a "you Black Orc SOB... I'll get you this time!"
In short... wargamers, warhammer fans, MMO PvPers, people who defended the Crossroads when you were outnumbered and outleveled; you will LOVE warhammer. It's just plain fun.