I loved the music of R:TW. I mean loved it, especially the battle themes and the Credits song. I'm seriously considering buying the game cheap right now just for that music (I'm one weird chap, eh? I already re-bought Dungeon Siege for nearly nothing just for the music).
I hated two things about R:TW, though: The lack of proper naval battle and the horrible city path-finding, as well as your inability to lock gates as you could in the Age of Empires series. I hated ordering my troops too close to the gate only to watch them run through it and get slaughtered.
"One of the bitches actually gave birth while she was attacking, and her puppies joined in on the carnage."
--the awesomeness that is Boatmurdered.