if it's for a good combat system i'd rather play some action mmo.
Monster Hunter or Dragons Nest do it way better then any MMO i currently know.
i was actually looking forward to Tera, but when it came out i had fun with the combat system for like 2 hours, but got bored of the game itself rather quickly.
i'm fine with a game that delivers in more ways then just a good combat system.
if everyone would only play a game for it's combat system, FFXI would have never made it to the year 2011 XD