This was my first time playing GW2 and I only played 30 minutes over a few classes and I gotta say, I was really impressed (I skipped the intro's and just did some events nearby to not spoil anything). The environments are amazing (well at least compared to WoW), and the combat feels way more involving.
I think my time gaming is going to be 70% GW2, 20% MoP and 10% BF3.