Windwalker Monk
I'd like a complete redesign or removal of Fists of Fury. It's one of the biggest points of contention between different theorycrafters on the subject. It's a channeled melee attack, so on anything that isn't stunnable it's easily a waste. I also doesn't do enough damage to make it that much better than just spending those resources on other abilties during that time. You don't autoattack or gain chi while using it. Since beta people have been asking for Blizzard to rethink the whole "stationary channel melee attack" concept and even Chen Stormstout in his temporary vehicle mode allowed you to channel it while moving. Removing it entirely would require moving Rising Sun Kick down to level 10, though. Not exactly a problem, really.
Other than that, as cool as clones are, I wish instead of giving us an ability that requires an addon or mouseover macros to use without losing GCDs to human reaction time they had just made our Tiger Strikes act like (a weaker) Flurry of Xuen. With our current cleave, though, that would be extreme overkill.]
Guardian Druid
Remove Maul. Period. Seeing it spammed by a tank in dungeons is one of those really annoying "oh crap, he's going to die a lot, isn't he?" signs. The fact there's a big OMGPROC symbol on the screen telling you to waste your rage on maul when leveling despite that you should really be spamming it on your defensives is just counter-intuitive.