According to the ESRB, this game contains: Violence
Parents have nothing to fear. Theres nothing extreme or distasteful in Sonic Adventure 2 besides the negatives which I listed above. In terms of questionable content, theres no harsh language, no nudity (Sonic IS wearing shoes, after all) and no violence of any consequence.
Gamers in general should probably rent Sonic Adventure 2 first. Its very eye-catching and attractive, but the dazzle soon wears off and I feel its safe to say that its not going to be everyones cup of tea. The Knuckles/Rouge missions alone are enough to kill most of the good feeling the Sonic/Shadow portions may generate, and Sonic Adventure outdoes the game in every area that really counts.
Sonic fans are either going to be extremely disappointed or marginally satisfied depending on how fanatical they are about the hedgehog. I think Sonic Team got away with some serious underachieving here, and I expect them to batten down the hatches and make the next Sonic game more shipshape than this one was.
Dreamcast owners will probably want to pick up the game since its anybodys guess how many new titles will actually make it to stores before the system is officially lowered six feet under. I cant really recommend it, but you might want to savor these last few releases before the Dreamcast goes completely into the secondary market.
Hearing-Impaired gamers get full access to the games script with accompanying text. Its actually a godsend, since the voices get drowned out by the music and I couldnt even understand what they were saying half the time.