It all depends on the representative you speak with. There have been times where I've had to contact them and have had a pleasant experience, but as I detailed in another reply in this thread, I've also had godawful experiences where I simply couldn't believe the logic the representative was trying to apply to the situation.
I agree with user hololy, I'm a little confused as to what you're trying to get at here.
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.
Comcast always gets singled out for their terrible customer support, but in my experience, it is no different than other companies of the same size / in the same space. And no, I wouldn't consider their service as bad, it's just what I would expect from a company of that size. And yes, I think as a company's CS is scaled to such a level, you will inevitably see a decrease in support quality. Compare their support to other tech giants of the same size and you will see the same issues.