Wow calm down on that hot take that an incredibly popular show that was on the air for 8 seasons was good.

Blonde Donna marks the part of the show I generally can't stand anymore. There's a run before that moment that gets kind of tiresome - basically "Donna is a horrible bitch to Eric after breaking his heart but Eric is also kind of a douchebag about it as well" gets insufferable but fortunately it does end eventually.

Blonde Donna does not end eventually.

Also while season 8 generally sucks, it has one of the funniest scenes in the entire show. I can't remember what episode it is, but it involves Bob trying to order from the drive-thru at the burger place while the gang are hiding in the bushes.

Also post-Blonde Donna has a really hilarious episode involving a vacuum cleaner and a lot of paranoia. So it's worth watching the entire show I think, just know that when you see blonde Donna that's about when it's just not as fun anymore, and also when it makes progressively less sense that Red is allowing all these now adults hang out in his basement all the time.