Warrior burst is not too high as other classes also burst as hard, and as such it is balanced. Create some classes on the PTR and run thru each's own swifty macro, and you will see for yourself. If Warrior burst is too high, then so is Warlocks, Balance, Feral, Enh, Frost, Frost, Fire, Arcane, BM...
If anything we need a substantial damage buff so Warriors are competitive enough to get into RBGs, like Frost DKs or Moonkins or warlocks. Which no one seems to ever complain about, yet which always get spots over warriors!