A good Warrior will know when the burst is coming and will save Die By The Sword, Shield Wall, Kite With Heroic leap/Piercing howl and oh yeah use shockwave every 20 seconds.
Rednine already mentioned defensive Stance and how stupid it is. Warriors get enough rage from Second Wind that there's no drawback for them to just sit in defensive stance with a 25% damage reduction.
The thing that bothers me about Second Wind is that it doesn't require the Warrior to do anything and the fact that its endless. With all of the control and silences Warriors have with defensive stance and Second Wind, I'll never understand how they complain about 1v1s against Mages. Not to mention they have two reflects.
Warriors also need their good abilities to actually cost something. Shockwave should not be free, it should at least cost 30 rage. Mass Spell Reflection should cost 15 along with this regular one. Avatar should cost 30 rage. About 80% of what Warriors do is absolutely free of resources and doesn't require any sort of risk. This is why defensive stance can be abused.
Oh yeah, I can't wait till some people figure out how badly Sweeping Strikes can be abused.