See, I don't know if I'd compare Richt and Miles too much.
Miles' results are pretty good, he just makes a lot of foolish decisions and has actually had a lot of good luck. He also can't develop a QB for öööö. I don't know that I'd fire him if I was LSU, but I would certainly not want to hire him anywhere else.
Richt's results are damning, IMO. They are a guarantee to lose just about every big game. Richt can't even win the pathetic SEC East over the last few years, and the one time he actually did win some big games, his team lost in the SEC title game directly because of an inexcusably bad decision he made.