WoW is the best, by such a wide margin that it's ridiculous.
If you don't like WoW, maybe the genre isn't for you. Maybe you just didn't try it long enough.
To really get a feel for any MMORPG, you need to play for about a month solid, getting a few characters developed enough to get a solid feel for the gameplay. MMORPGs are simply too complex compared to other games and require a experimentation to truly be able to speak about them.
For 2nd tier MMORPGs, LOTRO is solid and enjoyable, EQ2 is good. I couldn't get into WAR but I guess it might be considered here. I never tried AoC either since it was obviously a steaming pile at release. VGSOH was abysimal at release but cleaned up to be OK, and has some really good class designs. It might be below 2nd tier though.
Dungeon Runners is a good and humorous pseudo-MMORPG if you don't want to pay for the best entertainment value in existence (MMORPG subs).