They're certainly nowhere near the standard of 1990s or 21st century kits in terms of detail, moulding or accuracy, but they aren't at all bad considering the moulds were designed in the late 1950s. And the ITC/Ringo/Glencoe range contains some absolute gems in terms of subject matter.
The ship kits I know of are:
1/225 USS Oregon (Indiana-class predreadnought battleship, fought in both the Spanish-American War and WW1)
1/74 WW1 Sub Chaser (USN 75" submarine chaser; can be converted to a WW2 SC with a lot of work)
1/120 Corsair II (JP Morgan's steam yacht; can be converted to the gunboat USS Gloucester with some work)
1/48 Coast Guard lifeboat
1/500 SS United States
1/500 SS France
I think Ringo also reissued the kit of Fulton's steamboat "Clermont", which later reappeared under the Lindberg label. Also listed on "Rajen's List" are a 1/350 Graf Spee and 1/96 schooner "Water Witch", neither of which I've ever seen. ITC apparently produced a number of other kits, including the 3-masted yacht "Atlantic" in 1/96, a US Gato-class sub (Halibut) in 1/170, USS Enterprise in 1/400 (is this the one which Revell reissued?) and a 42-foot motor cabin cruiser in an unknown scale. They also made a set of tiny ship kits, including a tug, paddleboat, Viking ship and Chinese junk, which Glencoe have recently reissued.
The Oregon is a bit sparse in terms of detail, and really needs either some scratchbuilding or an aftermarket PE set (I believe Toms Modelworks produce one) but the Corsair II and sub chaser will produce nice models when built "out of the box", though extra detail will improve them. I don't have the lifeboat or the civil ships so can't comment on these kits.
Even their aircraft range includes some unique subjects - their 1/48 Grumman Duck is still the only injection-moulded kit of this plane I know of. And the Curtiss Condor, Martin MB-2, Hughes Convertiplane and Navy blimp (have I forgotten any?) are unlikely to be available anytime soon other than as resin or vacform kits. (I've built the MB-2 and it turned out nicely with some work). The only real "turkey" in the Glencoe aircraft range is the "1/48" D.H. Venom which is more like 1/55 scale and very crude.