Have you noticed the new in-game water effect? It ripples nicely.
Coupled with that are intense lag in Dalaran, intense lag when my Pally uses Judgement or other spell effects, even tournament jousting is pretty much lagalicious, the fact that most of my old addons are out. And not to mention changes that make my level 80s feel like noobs are playing them.
I did mention the ripply water, didn’t I?