Eh, the alternative is the anime makes up an ending, and that rarely ends well either.
eh not always. as someone that rarely reads the manga, if ever. animes can often have good endings, but i do agree plenty of times an anime has terrible cliff hangers.
and like the other guy said, i enjoyed where fruits basket ended. funny side note....my friend got me that as a gag birthday gift, because we both were expecting a sappy rom-com slice of anime....so we sat down fully expecting to embrace some horrible crappy gag gift and to laugh at it....and ended up loving the damn show and being shocked by what it was actually about.