Here's one that gets on my nerves. "5D/5DII AF sucks!" Often that's posted alone when these cameras are discussed with no other explanation. Compared to what? If you say Nikon then fine, are you prepared to get an entire new set of lenses, flashes etc. to get better AF? If you say 1Ds models do you really want to spend that kind of money?
I don't think anyone who actually owns these cameras will argue that the AF is perfect but to say it sucks is a little over the top IMO.