6 hit a lot of topic's nails on the head. Also, Chloe has had that set up(piercer/bow at least) for a while, Tro wasn't the first, just probably the "richest" to do it.
TL

R of 6's p
BMs = easiest high lvl farming, speed is @ the top...including archer/BMs
DDs/DoTs = way too much clicking, but have good speed as well, just need hella more gems and crap to get there.
2H = fairly easy to build, fairly good speed.
DW = bout 10-15% slower than 2H by dps standards...but basically teh same builds...although some gems help them sliiiiightly more than 2h, and have some cool combos.
Sure, some balancing would be nice, but also, PvE =/= PvP, and 1 build can't be the best at everything...at least right now it isn't. DoTs are probs the strongest all around atm, but give you carpal tunnel pretty quickly unless you do hand work outs everyday.
IMO, the only thing that really needs adjusting, is regen. And it needs to be nerfed!