You may have had a positive experience, and that's great. I'm genuinely happy that you have enjoyed being a Comcast customer, and I don't say that with any sarcasm. Hell, as far as general internet service goes, I'm content with the product that they provide. My experiences with their customer support are personal, just as yours are - you've clearly spoken with some level-headed, respectful representatives. I, however, had to argue with one for thirty minutes when I told them that my landlord has already setup Comcast for me at my new home - the representative insisted that it would "benefit me" to transfer my service and have two internet connections at the house.
All I'm saying is that everybody's experience is different, depending upon the representative they speak with. Some reps are great, but on the whole, the bulk appear to be subpar.
Now, to answer your question. Yes, I would say their support is worse. I had bad experiences with Chase, too, but even they didn't come close to what I've had to put up with Comcast. The only large corporations I deal with these days are Google, T-Mobile and Nissan. All three have exemplary customer service compared to Comcast.