TW is incredibly good damage if you build for recharge. Having momentum up every 20 seconds makes you a beast. Combine that with the crit bonus from sets and you can reliably hit upwards of 1200 damage on arcs of destruction when critting. I went bio armor as secondary and with complete sets, you don't even use endurance in efficiency armor.
You also have a ridiculous amount of soft control in the form of knockdowns. I routinely hop into +4 x8 packs and kill without worry because they stay on their backs. Here's my build:
http://www.cohplanner.com/mids/download.php?uc=1496&c=692&a=1384&f=HEX&dc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
