Sonic Adventure 2 was much, much, much better than Sonic Adventure 1.
Pretty much, it took the best parts out of SA 1 and upgraded them, adding new experiences to boot.
I loved the Knuckles/Rouge levels, since it was always a challenge finding the three shards of the emerald fast enough to get an A rating.
The Tails/Dr. Eggman stages were pretty good as well, the use of their homing system weapons kinda reminded me of the homing laser in Panzer Dragoon.
Sonic/Shadow levels were awesome, pretty much the best 3D Sonic Levels I've played so far. It had a good sense of speed, especially the ARK levels.
And then, there was the Biolizard ultimate showdown.... Pretty much one of the most epic confrontations in any Sonic game.
So yeah...I don't agree with you at all 
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CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
