I main MW but leveled and did solo content (WQ etc) as WW as it was by far both best AE (lol pre nerf sotw) and best single target burst (elite etc). The heal after each kill also grants good survavibility and no downtime.
But as i geared up i switched to BrM. Damage is ok, but more importantly it's unkillable, anything including world bosses on the broken islands or the ton of big trashs everywhere on Argus (until we get flying mount..) can be soloed...hopefully other people join the fight to speed things up, lol.
Also the ae are more convenient to use especially for pulling things fast (i'm on a pve server so if that nasty draenei pulls before you, you have to find another mob) as you have both targeted ranged ae, ground targeted ranged ae, self centered ae, with low cooldowns... and OMG YOU DON'T FUCKING HAVE TO BUILD COMBO POINTS WITH MELEE SINGLE TARGET BEFORE USING THEM.
All specs have good movments so it's not the important points.
Never understood people questing as MW, slow, boring.