I play it. If the concept of manually controlling the attacking swings, blocks and dodges sounds appealing to you, it's a fun game. It's a Korean MMO that has been westernized, but it is ***not*** a Korean grindfest MMO such as Aion. The game has more quests than it takes to reach level 60 by a factor of like 5. Personally, it has met all of my expectations and I'm really having a good time playing the game. It's like playing WoW in the early days when things such as battleground were still being refined and developed (same in Tera, battlegrounds coming in the near future after they're tested on the Korean client) and such. The gameplay has been very engaging to me and as a result I've been able to feel motivated to leveling alts alongside my main, and keeping all the characters within about 4 levels of each other.
If the idea of the combat system is unappealing to you, avoid the game. The combat system is what differentiates it from every other MMO, and it is why the people who are playing the game are really enjoying it, and it is why the people who were not interested in the combat and hoped for some kind of SWTOR AAA RPG Story were let down. The game has a story, but personally I don't care about it. I just want to play an RPG with all of my friends where if I want to block, I have to stop attacking and physically put my shield up in time before a big attack lands. In that regard, this game delivers in spades. For that, I really appreciate the effort from the Tera team.