I play this game everyday and I believe it's fun, but repetitive. Once you reach level 65 on PS4 there are about 12 dungeons you can do and that's it. They also do seasonal events, but some of them are boring. Don't get me wrong I love playing this game, but if you don't like grinding and such I don't think you'll like this game
This game is free to play so you have nothing to lose if you just try it out. There are several classes divided into three (healers, DPS, tanks) so you can try all of them. The PS4 NA community is pretty full and active. Most people are available to help if you ask kindly and if you join a guild there are people willing to help.
*Edit: Do not buy loot boxes unless you won't be upset about the outcome. Loot boxes are RNG based so it's not guaranteed and you can always buy the non-dye-able outfit on broker or in the TERA store. I myself have bought around 50 lootboxes and have gotten nothing, doesn't mean the game is bad. Just my RNG is garbage.*