Deadmarye: [...]
How good are Zwei and Zwei Zwei(lol) ?
I've heard great things about the Trails serie and Tokyo Xanadu Ex, though I'm less sure the last one would please me.
I've recently played
Mary Skelter : Nightmares which I also did not like due to its visual novel presentation (some sequence were too longs right from the start.)
It's not a "JRPG" in the sense it wasn't developped by a Japanese dev but
Septerra Core: Legacy of the Creator, while old (1999) isn't bad at all, and as you can see from the Artstyle, it's inspired by JRPGS. It's at -80% during the sale. For a buck or so, it's a good deal.
Rule of thumb is, that GOG is not such a good place for JRPG fans. Many releases are more in the 7/10 area, which usually means they are not terrible, but they might leave you wondering why you play this instead of the abundant selection available on Steam for example.
Zwei is a mixed bag. The combat is very basic, essentially consisting of attacking and dodging, with some likable characters. I eventually got into the game, but it's really a hit or miss I would think, more like a 6/10 game that just clicks with some.
Both Xanadu games are also some genuine 7/10 games. The first is a bit of an action RPG with very limited build variety. The second one has an enjoyable action combat system but everything around it feels a bit like a bare bones Persona copy. Writing, characters, etc. are all not terrible, but don't make it beyond serviceable either. There is a fast forward button and I use that for much of the conversations.
I only played the first of the Tales games but really liked it. The closest comparison to me would be Grandia 1, although the combat is slightly weaker (although similar).
Some more titles on GOG:
https://www.gog.com/game/legrand_legacy https://www.gog.com/game/the_alliance_alive_hd_remastered