What is sad is like many MMO games, Vanguard comes instantly to mind, the game had a lot of potential, but due to things like budgets and such they get released well before they are ready and what we get is a paid beta.
Anyway, back on topic. I no longer have my trial key that they gave me for doing closed beta, gave it to my roommate a few weeks ago for him to try out and to see how the game has fared since release. Its pretty much still a paid beta, but if you play it for like 30 min at a time it could be fun. It just gets extreamly repetitive, even more so than WoW.
I was actually in the same boat as you a few weeks ago... got sick of WoW after almost 3 years, played the rest and was looking for something new. Honestly like pontifex said there really isn't anything else out there right now. My suggestion would be to maybe kick MMOs for a bit and try something else, I recently got Command & Conquer 3 as well as the First Decade pack and have been loving it, and wait till this summer when we see the first of the new MMOs come out. We have Age of Conan in May if your looking for a nice PVE/PVP game, and there is also Warhammer if your looking for a lot more PVP.