Gameplay is great, dungeons are good. Raids are some of the best but that's kinda dying out because of no new announced raids. There are of course issues with this game but I'm sure you'll see some of those posts around here.
I played Tera for about 6 years, GW2 up until level 80 and WoW. If I have to choose between those 3, tbh I'll pick BnS. Tera's story and characters weren't that interesting and the game is shutting down unfortunately. GW2, I'm not saying it's not good, it's good but I wasn't a fan of events and the horizontal progression. WoW is just.... wow. The questing while level is super boring and I moved on from tab targetting so that just bored me even more.
Overall I suggest trying the game out. The story and characters are great, which is fairly rare for a mmorpg. It also gives gear and there's soul boost going on to help gear too.