I'm enjoying it, as someone who wanted an MMO like WoW that wasn't WoW to play fairly casually.
It's f2p model is good, all areas, dungeons and raids are free. The shop doesn't sell anything that makes you have better stats, just xp/money boosts and a lot of conveniance items (spawn a mail box or shopkeeper for example). You CAN buy some gear in the shop, but they're not that great and cost way too much, and you can't get all the best stuff with real money. There are also 4 talent trees from the expansion that you need to buy, but the areas of the expansion are free. You can get the real world currency from the auction house, but it's not really a viable option yet as the auction house prices are insanely high, it might die down, might not.
Best f2p model I've ever seen in an MMO, but I haven't played many.
It is the rather old school combat hotbar system, so if you didn't like the combat/gameplay of WoW or older titles this really won't do anything new for you. If you just want WoW that isn't WoW then go for it, but it hasn't got much that's better.
So, good payment model, same old standard MMO gameplay.