tbh, I felt the same when BC and WotLK both first came out. I recovered after BC and ended up really enjoying myself again in game, but since around patch 2.4 I have yo yo'd back and forth between hating it and just having an apathetic viewpoint.
I may go back, eventually, but I just don't "feel" this expansion (wotlk).
Good luck, I hope you can have fun again. Maybe you just need some "alone time"
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