The show was legitimately good for its first 30 years or so
That's interesting, since I pretty much assumed the show was always basically shit, which I just attributed to the concept/nature of the beast. When you have a full ensemble and only have a week to put on a full production and have to do this every week with accommodating all of these people, then it's not exactly surprising that 90% of that will be slop. I'm not an avid SNL watcher, I only ever watched a couple of clips, but that's what it always felt to me like: Reject theater kids who will not stop beating the dead horse, because they're very well aware that there's an hour left they have to fill.
Obviously SNL is still a net positive overall because it gave people like Amy Poehler, Tina Fey, Seth Meyers, Bill Hader and soooo many others (Conan, Will Ferrell, the list goes on for a while) a way to get started in the industry; but the show itself was just never something I would want to watch for a full hour, much less so week after week.
It's kinda funny in a way because I actually started watching 30 Rock before I was really familiar with SNL itself, and I always assumed they dumbed the humor down for the in-universe show to make it seem more goofy. Surely the actual SNL would be actually funny, right? Well...
I do wonder if I would've seen this differently if I would've been alive (and old enough) back in the day to watch it in the 80s or so already, since I can at least appreciate that it did really break some new ground and really did try some new approaches. I just genuinely assume most of the sketches always sucked and had that theater kid vibe. 80s Letterman for example (to name something different, but comparable, from that time) is amazing, so I'm kinda thinking this just circles back to the nature of the beast I was mentioning earlier.