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D60 - Supply problems meant it was hard to find one, and there were a few problems with the camera, it was replaced one year later by the 10D.
300D - No manual metering mode, had allot of hidden features from the 10D that were eventually unlocked by a firmware hack, cheap feeling plastic body, only available in silver until a limited edition black 300D was launched near the end of the product cycle, Error 99 issues when using third party lenses.
30D - A 20D with bigger LCD screen, ISO in viewfinder and a few minor changes.
40D - 10mp sensor while the 450D got a 12mp sensor, and the low resolution LCD screen.
50D - First Canon sensor to feature gapless microlenses and people complained about soft images, and high ISO performance was worse then the 40D.
60D - First XXD series camera to get a plastic body and caused controversy and is often referred to as a 'Super Rebel', lack of the AF micro adjust feature.
7D - 18mp on a APS-C sensor and people complaining about AF accuracy, it was also the first Canon camera to feature the new Canon translucent LCD viewfinder with no option for interchangeable focusing screens.
5D - Some copies had the mirror fall out.
5D Mk II - No improvement made to the autofocus system, banding problems.
5D Mk III - Priced higher then Nikon D800 and no real significant improvement in megapixels over the Mk II.
1D Mk III - Autofocus issues that canon kept denying and then they finally admitted there was a problem and all the issues with trying to come up with a fix that actually worked.
1Dx - Only 18mp, and now merges the 1D and 1Ds lines which is controversial for those who need a high megapixel camera for studio work.