Because it was the least band-oriented album they ever made: Rick Wright didn't play on it at all, Nick Mason didn't drum very much on it (he mostly created sound effects for the album), and David Gilmour wasn't fond of the album overall either. Really, it was a de facto Roger Waters solo album.
Now, if you like later-era Floyd (i.e., "Animals" and "The Wall"), it would make sense to enjoy TFC too - they are the most Roger-dominated albums, and a lot of the songs on TFC are very Wall-oriented.
Really, the last album created and approved of by the whole band was "Wish You Were Here".
The Wikipedia entry describes the chaos surrounding TFC:
https://en.wikipedia.org/wiki/The_Final_Cut_(album)