Most positive?
Probably back in Vanilla on my NE Druid back when we were raiding AQ40. We didn’t have enough people one night, so we decided to camp the road just outside the Cenarion hub on the way to AQ. About 15 of us either had stealth or were Night Elves with Shadowmeld and the remaining two were Human warriors. So the warriors took off their gear and danced in the road while the rest of us stealthed off to the sides nearby. Most Horde stopped, laughed and moved on, but if they attacked our humans, the whole raid would descend on them - DPS, healers, the works!
It’s one thing to be ganked out of nowhere by a Rogue, but quite another to be ganked out of nowhere by a nearly full raid.
By far the most fun time ever. We did it for maybe 45 minutes - some people on the realm forum even complained about us.
Negative?
I honestly don’t know. I think the old school Sunken Temple runs when people didn’t know what to do and then people got lost, the dungeon started respawning…turning into an hour and a half expedition…that was pretty Negative.
BFA Voidform for Shadow was pretty lame too.
Maybe I just remember the positive things better.