I still think the middle section, in 6/8, of Twenty First Century Schizoid Man is wonderful and amazing, (though I'm not particularly crazy about the song's vocal ); and I think that first album as a whole is quite wonderful as well.
Graeme, if you haven't listened to the middle section of Shizoid Man in a while, you might want to go back and give it another shot. Greg Lake's bass lines, Michael Giles' drumming, all of it is superb. The contrapuntal lines, the use of full stops, how all the parts are woven together; not only is it great playing by the individual players, but it's great ensemble writing and playing. If it's the vocal that you don't care for, you can skip over that part .