I've been revisiting anno 2205, infamously the ugly duckling of the Anno series of RTS games. I don't mind so much the fact that it's different, lacks customisation and random map generation - I'm bothered because the game is so slow to progress through on challenge settings, and it feels like a game designed just to artificially waste your time; in other anno games, you can always pull tricks to dig yourself out of economic crisis - selling off assets and surplus goods, completing quests for other parties, or taking loans. 2205 is very very confined in terms of what you can do to financially recover in the early game and forces you into a lot of military events.
I had a similar experience with BC, though I was only in tier 2 armor (our guilds just couldn't must the runs to get much of the tier 3 stuff). I played further than you did, but I realized that I had been really ready to be done with WoW for a while and had held on just for the expansion. It didn't revive my desire to play at all, and honestly I haven't wanted to play an MMO since.