Comcast "support" is almost not better than just having robots at the other end, never have I ever gotten a problem resolved from support, I've just had them try to upsell me relentlessly. To this day my Comcast email is somehow setup wrong and I no longer care to try to fix it.
Interestingly, Comcast has been one of the consistently better support experiences for me over the years. Usually very quick and pretty helpful, even if it is just to schedule someone to come out and look at the problem.
Their service in general has gotten kind of unreliable around here the last year or so, with a handful of widespread outages, one of which lasted almost an entire day, but the customer support has never been something I've been unhappy with.