I honestly think I'll remember it fondly, I wasn't terribly pleased with how some of the progression played out but I really enjoyed it. Ulduar was a shining example of what raiding can be, and ToC was really a lot of fun (It was! We were just stuck with it for way to long :P). The questing was more or less really pleasant and the zones are incredibly memorable (Grizzly Hills and Storm Peaks will be up there in my list of favorite zones for a long time.) I had good times, but I'm going to embrace Cataclysm with open arms.
WotLK will be far better to remember than it was to play.