Pretty off topic but can anybody tell me if other MMOs have these constant class adjustments. It just seems it should not be THIS hard to keep 6 classes balanced.
Maybe, but it's only a result of them making stupid, hack fixes to begin with. For example, warriors in extremely high-end gear were doing ridiculous shit. Insanely high raid damage, insane burst damage in PVP (even with FURY, honestly). It was probably getting out of control. So, instead of fixing this through itemization or talents or something else reasonable, they just flatout nerfed rage generation. Initially they said it'd only effect those in high-end gear, and some warriors in lower end gear might even see an increase in generation, but in practice it turned out that pretty much everyone had their rage generation turned to absolute shit or something, and as a result there was of course the collective whining of all warriors ever. I guess they watched the video of Hulksmash in PVP, and that other video of the warrior sustaining like 1400 DPS on Patchwerk, and decided that wasn't a skewed presentation at all, and proceeded to base their ideas of balance around the fact that ALL WARRIORS were doing that and fuck 95% of players over.
So yeah, all warriors I know complain about how now they can't get any rage at all, whereas before maybe it was a little overboard, now it was absolutely terrible and way more than Blizzard said it would be. I guess that would explain the 15-20% increase for all warriors. But uh, I don't think this type of stuff happens often. Only when they find a slight imbalance, manage to fuck it up so that in rebalancing it they actually make it far, far worse, and eventually have to correct it to stop all the complaining. Other MMOs probably do the same things.