Virama: Doesn't answer the question though... Is the gameplay GOOD? Like, a game can be enjoyable but difficult to play (and thus, extremely niche) or easy to play but hard to master, or ... or... etc etc...
How similar to WoW is it?
Hmm, I dunno, depends on what your aim in game is. You can play PvE (like, missions, quests), you can grind PvE (like, dungeons, hardmode, titles, farming of rare items/money) and it can be hard, then there is PvP, which can be easy if u play it casually or it can be very hard if you play top competitive GvG (with a lot of theorycrafting, tactics, builds development and so on). And of course there is always game-breaking stuff, which can make you win easily at both PvE and PvP before it's fixed.
And I'm probably talking out of my ass about PvP since I haven't played for 2 years and even when I played, I wasn't very good at it.
About WoW: PvP part is not WoW at all, PvE part have some similarities, but still very different too.