There’s a certain irony that you ask for data instead of anecdotes to chastise /u/blackearl’s claim, then provide a personal anecdote to support your claim.
This seems like a reasonable start to build a case against Comcast:
When I used comcast (which was several years ago) the actual service was fine - it was the terrible customer relations that really got my goat, and it's harder to quantify customer satisfaction but the fact they aren't the absolute worst company isn't a mark of honor, showing up on customer surveys as one of the worst companies is enough of a black mark - the ranking is less important than being on the top ten at all.
This seems like a reasonable start to build a case against Comcast:
https://en.m.wikipedia.org/wiki/Criticism_of_Comcast