i'd say wl/m. yep, won't be the top scrut in party, but:
1. warped charge affects everyone around, even out of party. that's i think 13+% attack speed and 7% cast speed, for everyone in party. imagine how much wouldn't w/m and all phys dps classes would like that. the buff lasts longer than it's cd.
2. the debuff that increases by 36% fire and dark damage dealt. can't talk about how much would all mages and w/m would like that.
3. has AoE party buble, and single target buble no cd.
4. has a few CC skills, lightning, fear, an elite that stuns when weakened, and slow when weakened, and a silence.
5. has a group berserk like skill.
6. got a insta cast combat rez, and a willpower skill that decreases crit resistance. that's more crit rate for entire raid.
besides that, not a dead dps
got a 1 min duration 20% cast speed buff.
wl/m can be constantly in willpower mode, rotating flaming heart strike instant wich ads 3 psi, and soulbrand sting, wich costs 1 psi and resets cd of flaming heart strike, so just alternate between those while in willpower, and then when it's over recast it again.
30% increased int if imobile.
few skills hits twice due to elites, not so strong the 2nd hit, but...
well, if you like to dps, and be useful, wl/m is a really nice option,