Everything before RH8 was ugly as pants. RH7.1 and 7.2 were crashy as well as being horrible to look at. RH7.3 was pretty stable.
RH8 was a drastic improvement so far as the UI was concerned. It had that one bug in libc which made broke external mysql connections (bug id 77467). The way I fixed it was to pull in some kind of grotty third-party version of libc. But I was so happy about the UI fixes that I was willing to overlook any other problems.