Yup, as you can see if you click on Cavalary's link, I'm a big fan of and small expert on Unlimited Adventures. I've been playing it since the end of the 90's on and off, and it's probably my most played game next to Neverwinter Nights. That being said, the guide should be pretty outdated by now and I've been a bit out of touch with the game and its community during the last years, otherwise I would have updated it at some point (plus, I'm afraid that updating the guide would destroy it, due to GOG's forum/formatting issues). IIRC, by now there is an easier way to run modules than via that old DOS program UAShell, but I forgot what it's called.
Anyway, my opinion is similar to that I have of Neverwinter Nights: the campaign that shipped with the editor is rather bland, but modules made with the editor are awesome (especially those using custom haks)!
Also, I've never been into the Goldbox games, so I don't think that's a requirement to enjoy FRUA. I tried to get into them retroactively at some point, but it's hard going back if you started with FRUA, because FRUA's engine is more comfortable than and (to me) graphically superior to the older games (because VGA), plus FRUA allows more text in-game, while the older games always pointed you to journal entries in the manual in order to save space. And I think most of the better user-made modules are less grindy than the official ones and give fixed encounters preference over random combat (a matter of taste, of course, but I dislike frequent random combat, myself).
Oh, and the official community forum switched address, so that's another reason the guide is outdated. The new address is
this. What still holds true though is that the people in the community are very welcoming and friendly, if someone has questions about the game.
Did you find this
list of recommended user modules yet?
I think the most popular ones are Ray Dyer's conversions of old D&D modules, aka
The Realm series, and The Sect by Ben Jockisch (possibly the longest standalone module).