As J-Dub said....they can be very hit and miss depending on taste.
More they can be hit or miss based on all the lineup changes. Different eras have produced different sounds.
Classic lineup - ItCotKC, ItWoP. The first album is a classic, the second often feels like it is trying to be the first.
Boz Burrell lineup - Islands, Lizard. Worthwhile stuff in there, but really I'd leave it til the end.
Bruford, Wetton, Cross lineup - LTiA, Starless And Bible Black, Red. Probably my favorite era. Definitely recommend LTiA and Red.
80's lineup - Discipline, Three Of A Perfect Pair, Beat. Adds Adrian Belew and Tony Levin in place of Wetton. Probably would check out Discipline first. Personally, never cared for Belew as a singer, tho from here on out he sings most of the material.
Double Trio lineup - Thrak. Fripp tried adding another drummer and bass player to the 80s lineup. It works well enough, tho it seems superfluous.
2000 lineup - The ConstruKction Of Light, The Power To Believe. After many experiments, Fripp drops Bruford and Levin for the two guys he added with the Double Trio, Trey Gunn and Pat Mastelotto. Personally never warmed up to ConstruKtion, but I liked The Power To Believe.
The current lineup hasn't produced an album yet, but it consists of Fripp, Levin, Mel Collins, Gavin Harrison (Formally of Porcupine Tree), Jakko Jakszyk, Pat Mastelotto and Bill Rieflin. (Yes, there are three drummers in the band.)
There also has been various offshoots from former members doing Crimson and Crimsonish music - 21st Century Schitzoid Band, Stick Men, The Adrian Belew Trio, etc. There is also far more than just the albums, considering that Fripp has released just about everything live that he has on CD at some point.