It's given us plenty of time to level and gear out alts which will come in handy down the road when min-maxing and/or raid stacking are possibly needed.Personally I would have unsubscribed shortly after Wrath, or not even have purchased it if Ulduar wasn't on the horizon. Anyone who expected Naxx(lol old content) to be fun/challenging is a fool.
I was 70 for nearly a year before I leveled my alt from ~level 35 to 70 because I had less available time to play than now plus there was much more to do. Tabards for raising faction rep was a nice idea, but being unable to rep up in raids is shitty.
Also, allowing people to purchase gems for 5man emblems was a horrible decision. Jewelcrafting is barely profitable now and almost all cuts are going for about 50% what they did before 3.0.8. Using 25man emblems would've been a much better idea so people could choose between buying their own gems or saving up to sell bracers on the AH.