It's NOT the gameplay - It's the WRONG Country!,
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This review is from: TERA (PC DVD) (DVD-ROM)
Tera is a very good game. Make your you are either choosing to play Europe, or America. The free account you already have will probably be American. I had all the same issues that the other posters mentioned but I seemed to get around it... After installing it it failed at login for ages. I cut my losses and completely removed the free downloaded version AND the new 'disc' version. Then downloaded the whole thing again from the server (the one you download for the free trial. I then entered the registration key from the box...AND IT WORKED! I hope this helps!