I have only leveled a character to 7 so far. I got in at the tail end of cb 3. The grind is hell, I will say that (it was for cb3 anyways), but I am having a blast with a Demonologist right now. Pally I read is hell to grind till around lvl 15-20 then it gets a little faster. But overall, it plays like WoW minus no auto attack which I like because you cant sit there and whack a mob without pressing a button, you have to physically hit the button each time. You will notice a fatigue bar (blue xp bar under the normal xp bar) it gives you extra xp that you turn in at every inn keeper (option to rest turns it in), I normally turn it in every time I pass by one because once it hits its cap you dont earn anymore till turn in.
I havent gotten to try astral ships (they should be in this beta test though), the idea is interesting with the PvP , and some high end raids via traveling to the raids on the astral. You can be attacked after a successful raid by other people and they can take your loot if you lose a pvp battle in the ship. I think the game is awesome with the questing/raids of WoW and the PvP (I hear havent tried yet) of WAR minus the 18 bazzilion zones that killed WAR.