So I have been looking for some time now for some good games, but since TERA was glitchy on my computer and I had to uninstall it, I haven't been able to find many other good MMORPGs since. I've played a few mediocre and bad games, but I can't seem to find any other good ones that I'd actually enjoy. Any suggestions?

Try out Guild Wars 2.
It's not nearly as visually pleasing, but it gets the job done.

Darn, it sucks that you can't play TERA, it's a really fun game! But if you are a Star Wars fan, SWTOR is where to go. I know it gets some of hate about the non-canon storyline and stuff, but it is a pretty decent game. If you want something more along the lines of a fast-paced platform fighter game, Elsword is just that. If you want a true role playing game, look at Mabinogi, its just that. The graphics are a little on the older side, but the community is active. I hope I could be of some help! :3

By FTP I think you mean F2P "Free-to-Play".
Go for ArcheAge people will complain and say it's pay to win but it's really not. It's more Pay to Progress since non-premium players don't get the same benefits that Patrons get.

Like labor gain when you're offline. Tahyang is a smaller more tight-knit community depending on your faction. I'm a Harani and we just troll the shit out of one another.

I currently play Echo of Souls it went into open Beta a couple days ago, f2p and pretty fun so far