Very few (if any) are disasters. They are a low-budget outfit, employing less than "name" artists, and lesser known orchestras (often non-union orchestras - with more room to negotiate favorable "recording" rates, etc...).
I own about 150 Naxos discs, and I've never heard one that was substandard.
Sure, in some cases there are better performances to be heard. But, frankly, in most cases - these are nearly as good as anything else out there, and are usually only half the price.
Also, Naxos "American Composers" series is worth it's weight in gold (seriously). Most of the recordings are the only CD issue of those particular works, and in many cases - are world premier recordings.
As far as specific titles to suggest --- all three volumes of Arthur Foote's Chamber Music are really wonderful. The works aren't very well known, but they should be (at least among chamber music fans). Foote was an American composer (from Boston) during the late 1800's and very early 1900's - and his music is a bit like Brahms, in a general sense.
Vols 1 & 2, in particular, are really outstanding. (We were so taken with much of Foote's music, that my wife and I even had some of it performed (live) as a part of our wedding a couple years ago. We hired top-notch local string quartet.)
Anyway, buy all the Naxos discs you care to, at least in my book.