Not as good as SA1 but its a great game altogether.
Graphics: Ok this game doesn't have the best graphics. Yes We have seen even Dreamcast games or even worst Playstation 2 games with better graphics then this. But Sadly we all must tell ourselves that the graphics suck out loud. You will find scenes where you can see through everyone's legs. The only great graphics in this game i found were the cutscenes like when Eggman told the world he was gonna destroy it and shot the moon with his cannon. those were graphics that were good.
Gameplay: The gameplay of this game is easy to learn and fun and fast paced. You can find yourself enjoying the first part of the first level as you go down the city as Sonic in a board, dodging cars, and doing board tricks(which probally inspired Sonic air riders). You may not find Tails' and Eggman's levels too much fun(well thats just me) and Knuckles and Rouge's levels are decently entertaining. But Sonic and Shadow's levels are the fun ones. Shadow probally get the toughest levels cause his levels are an altared and toughter version of Sonic's Levels. If you want a fun fast leveled games, then get this game.
Sound: Im gonna be pretty quick with this. The sound isn't that impressive. Its modern day at best. Nothing too good but not too bad as well.
Value: Nowadays this game is a Player's choice and is therefore at most 30 dollars. Its a game worth it no matter what age you are.
Overall: This is a game with no too good graphics but is great fun and easy to learn. Its truly a classic sonic game. It is for everyone and it once again proves that graphics don' t make a game fun. Game is great.