Depending on who you ask.

Tangent: Imho, the only reason it is good is because it's not as grindy and / or the community just didn't put as much emphasis on min-maxing things. GearScore was a thing of course, but theory crafting wasn't anywhere close to what we have now.

Not sure that's true for me, very good raids (minus the trial). Ulduar and Icecrown being the highlights for my guild. Though didn't mind the single boss ones either. Trial was a little janky though but the fights were fun. The big progression guild we were part of up through burning crusade wanted to leave for greener server pastures, a handful of us were kinda done with hard progression and the cuthroat nature of it. Picked up a few more and did 10mans/hardmodes mostly. Hooked up with another guild like us for 25man but we only cleared those hard modes once.. 25man was still a management nightmare...

Played through pandaland, skipped warlords, came back for some of legion and then finally broke the habit.