My guess is that Comcast isn't all that much worse than any of the other providers, they just have a larger install base and more subscribers which hate the cable company. That means that more folks hate them, but only because they have more customers to tick off.
Your guess, based on no experience with the company, is WRONG. They are simply the worst company I have ever had to deal with. No one in customer service has any intention to help you, only to get you off the phone. All problems require a "home visit," even if the problem is on their end. And that can't be scheduled for at least a week. Every five minutes on the phone you get another suggestion to upgrade to a more expensive service. We should be able to sue for PTSD just having to deal with them.