Tbh Tera was never hyped as much as SW:TOR or GW2 and will most likely never be as popular. Frogster/Bluehole kind of suck in marketing imho.
Many people said stuff like "it's just a shiny asiagrinder" or "a game for boobs and pedos" and shunned it without even trying.
I still like it and will play it with my guild, it's not the most creative questing or the most captivating story ever but I think it's fun.
Also played it in korea/japan (shortly), EU Alpha and now Beta so I think I know the weak points of the game well enough to justify buying it for myself and my gf. ^^