I have so many complaints about this company, but I'll just focus on the two main points.
My internet drops signal at least twice a day and each time the router needs to be reset. It's really caused a lot of problems, mainly because I take online classes and I actually failed an exam because my service was lost in the middle of taking it. I've called customer service many times and I've gotten the same answer: Comcast does not support wireless routers. I'm sorry, I just looked at my calendar and saw that it's almost 2011. HOW CAN YOU NOT SUPPORT WIRELESS?! Everything is wireless! What they mean to say, though, is that they don't support routers that weren't purchased through Comcast. Therefore, the only thing customer service reps can do is tell you to unplug your router and let it sit, then plug it back in. A five year old could have figured that out. That doesn't fix the problem. And I refuse to give more of my money to Comcast by purchasing an "approved" router, just so this bull will most likely happen anyway.
Also, I rarely watch television but when I do, service gets interrupted probably about 3 times an hour. It's bad enough my service goes out, but it goes out in the most annoying way - the picture pixelates then freezes, and if there's any sound going on it gets all loopy, and sometimes there is even a big popping noise. I've probably uttered the phrase "I'm paying for this?!" about 10000 times since I've subscribed to cable.
I really wish there wasn't this huge monopoly on cable providers in my area because I would LOVE to terminate my service.