Runes of Magic FTW....
#1 It's
FREE. I don't know how many ppl I know wasting hundreds of dollars on WoW and other monthly-billed MMORPGs... to me that's asinine.
#2 Dual Classes. At level 10 you can create and level up a secondary class... and switch between the two at any time (at specific places, not in battle) which makes for interesting gameplay. Priest/Mage has very powerful offense and defensive spells, I play a Knight/Scout which is a good long/short range tank.
#3 Auction House. In-game eBay to sell off rare or not so rare items. You make far more money here than simply selling stuff in shops.
#4 Graphics. It's a clear WoW clone but I find the graphics a bit more polished, and considering the cost it's impressive.
This is a bootcamp option but still on the Mac.