I played through it pretty extensively, beating the first five missions and exploring most of solo areas. It was pretty enjoyable, but still has a way to go in order to become a big hit. Perhaps the most fatal flaw is that the combat is rather repetitive and lacking any real intensity. Someone compared the combat to Dungeon Siege, which I thought was pretty accurate, since DS's combat was quite boring. Maybe if the retail version has more varied missions and the combat is tweaked a little, it could end up being quite good, otherwise it's probably destined for mediocrity.
The PvP stuff, however, was great.
The PvP stuff, however, was great.