Shadowbane
While I did enjoy it at first, since I was playing it along with a good friend and even continued playing it after he stopped. (Though that was mainly due to the fact that It was my first MMO ever.) One good thing I will say about it though was, my god the lore in that game was fantastic, the manual even had ..basically stories in it that explained elements of the world. But after a while of doing kill or be killed warfare, it got kinda boring and without my friend to play with slowly lost its fun factor. However, the lore, was and probably always will be a good read.
City of Heroes/Villians
I never did stick around for 'Villians' release, but I did have roomates at the time that did get it. I played Heroes for a while and for a long time I had fun with the game. This again was mostly attributed to playing it together with my friends/roomates. This game has so many things about it that were perfect: Capes (done right), perfect rag doll physics (for a mmo), hand's down the best character creation in a mmo or any video game ever period. The only downfall for me was that.. the game after a while of doing the same things over and over again, not to mention my friends moved on to WoW, just seemed to lose that fun factor. I had more fun just flying around freely than actually going and doing missions in order to increase my powers/level up. Leveling just became too much of a chore and it just wasnt as fun without my rl friends too.