Biggest difference I saw playing the beta sessions - I only got to lvl 15, so it is what it is - was the dynamic content, i.e. Rifts. I like the unpredictable invasions by waves of badguys, and the fact that you still make exp and gain loot rewards from farming rifts as well as traditional questing and dungeons. I like the variety of souls and character builds, but at the same time I'm pretty sure that the strongest specs for whatever role (pvp, tanking, dps, healing) will become the norm in a very short time and make all that variety less significant.

If the Rifts are still cool at lvl 50, I'll be happy to play this game, since all my RL gamer friends dumped WoW years ago because they thought it was too boring (they left, I started boxing lol).

In the end, if you enjoy it then good luck playing, and if you don't care for it then good luck finding something else that you enjoy playing