It's remarkable what users will "put up with" when their core needs are being met. I don't like a lot of things about CL, but does it meet my core needs? Yes; I can reach an enormous number of people with a high rate of success.
It seems to me that CL is a great example of the 80/20 rule -- but unlike most other firms, they simply didn't bother to implement the other 80% of the features.