Combat is action-ish and fun, quest hubs galore which is bad, nice dungeons (but quite easy during levelling, you can even duo some with your companion if you're very patient).
Not your usual bloated hotbars MMO combat, works quite differently from the standard WoW system.
It's free, so you can't go wrong with it, just play 20 or so levels and see if you like it.
Just don't play Guardian as your first character, you can't go wrong with the others. I play hunter ranger mostly, with a bit of trickster rogue on the side.
As a caveat, think twice before spending points for powers: you can respec talents with astral diamonds (aka AD, main currency), but you can't respec powers unless you use Zen (RL purchased currency). You can technically buy Zen with AD at outrageous price for a levelling character. Nothing game breaking, but it's better to know beforehand.
I have a level 35 char with about 50k AD, should I buy Zen with them I could buy about 140, to respec you need 300. It's true you can get more AD while levelling, but it means doing all the daily dungeon, daily foundry (player-made content) and daily skirmish and often I don't have enough time to go through all that.
In shorts, I can't afford to respec till 60, not a big deal as I never really felt it was required.