It's so underwhelming compared to Adventure 1. That Dark/Hero side mode was a joke. There were only three different gameplay styles, no hub - it's called Sonic Adventure - and the Biolizard was a lazy excuse for a final boss.
"But muh Shadow"
He only had four levels and they were horribly spread out.
Compared to Adventure 1, Adventure 2 aged like milk.
KILLY12
thats why I payed extra for metal sonic even though I never unlocked him