Meh, I'll vote to the contrary; Comcast works roughly 99.95% of the time for me. Obviously that's an approximation, but I rarely experience outages and I've been using them from two apartments in the South Bay for 10 years. The first few years they'd occasionally have local service outages around 2am but since then I rarely have outages of any kind and my speeds are great. Not as high as they say I do but supposedly sometimes higher when I do speed tests.
And as far as alternatives, in the Southbay it's very limited. I looked into this when I moved earlier this year and even Sonic only had DSL available where I live now. AT&T didn't even offer gigabit, and I'm not exactly in a bad spot other than that it's a suburb area (but I'm extremely close to a HQ for a FAANG).