People say decursive is bad, but I say Blizzard is - they have so many bosses that require lots of movement, and they actually assume you're going to pay attention to their default ui and watch for debuffs that have to be stripped *immediately*?

Ages ago when starting Naxx for the first time we weren't getting the poison off from Maexena - which is like a 95% healing debuff. In phase 2 of that fight (the enrage) if this isn't removed and you're not uber geared you will wipe if the poison isn't immediately removed constantly. After wiping twice - and listen to the pally's and other healers whine about not needing decursive and being fast enough (a claim I disputed) - I made them get it before we continued - gave them a quick run down of how it worked and we downed that same boss with ease - and I have plenty of similar stories like that.

Someday I'd love to see these developers try to best the encounters they made - I doubt they could do it with the stock ui - even knowing ahead of time what was going to happen and how to avoid it simply because we are not computers or robots and sometimes its helpful to have some guidance.