I think they are very fun.
I liked them. I would say all the butt rock in the soundtracks was pretty influential on the music I hear in my head.
I would not say they are great. Or good, even. But definitely alright, with no real substitutes that truly surpass them. They scratch some oddly specific itches, and if you have a good imagination, they could be very inspirational because IMHO gaming took a sharp turn to the overly samey side not too long after that. But fair warning, they're from before devs really gave up on "intelligent camera" in 3D games, so not only is it frustrating, it's to an extent that was considered frustrating when the DC was still kicking.
Early modern Sonic is pretty cool and has a nice late 90s-early 00s rock aesthetic. It's kind of funny how the internet hates these games now but not even half a decade ago they were extremely popular and even overrated. Kind of reminds me of the time where games like Zelda 2 and Majora's Mask were once universally hated, but now they're considered beloved classics.
Apparently adventurefags are "rising up" on the interbuttz for the past few days since one of the popular jontron ripoff youtubers that made the game unpopular by shitting on it via youtube got outed as a pedophile/cheater, so everyone on twitter can freely harass him without consequence.
I don't know what you guys are talking about but I love the chao garden and I finally made my first chaos chao the other day after playing this game for over a decade
Personally speaking, I find the Sonic Adventure games great. I think 1 is better than 2, but 2 is still excellent.