Wrd/S is extremely good dps end game (ToSH hard). Strong summon chiron and your chiron will be donig 150k dps on its own in tosh hard. Add in morale boost for whole party which is huge in and of itself. DPS stat your warden and you'll be doing 600k dps on the final 3 bosses during burn.
Advisable to not level up frantic briar too high because that will suck your mana if you're aoe'ing trash pulls (which you should be doing).
On another note, there is plenty of room for utility class combos now ever since Sardo and ToSH came out. With the emphasis on strat over burn these days, you don't have to be best dps, nor do you have to be best tank to be an integral part of end-game groups. Some examples are M/P for cleanses on Jenny in ToSH instead of M/W or M/S. W/K or other off-tanks for off-tanking ads on ToSH 4th boss, 2nd bear on Annelia, Ice brother in AC (unless, of course, your P/K can tank it). Also useful for torch bearers on Jenny Giant. You get the drift, you can find a spot if you learn strat and can play crucial roles well.
Back to the original, however, Wrd/S competes quite well with R/S in end game dps. They've quietly been dpsing so well because only their scrutinizer picks up chiron dps. Eldebil on Palenque has a strong-summon Chiron that sometimes tops 200k dps on fast burns in ToSH hard and it outdpses some of our other dpsers. He's half tank statted half dps statted and can tank ToSH norm on his Wrd/S. So if he were pure dps statted, he'd be tearing down the house.
He's now made a champion/rogue though, and it is a nasty nasty tank