11 years of improving game design does a great job of highlighting the numerous issues present in Sonic's first true foray into 3D.
Sonic Adventure is Sonic's true debut in 3D, and as such, the gameplay that once defined the series has been drastically altered in order to accommodate expectations for a 3D game at the time of original release. As time has gone on and Sega has continued to make games in this style, gamers have come to loathe Sonic titles due to this fact. Regardless of all the hate, I always felt like Sonic Adventure was a genuinely good game. Revisiting it 11 years later has proved otherwise.