It is fine. The American Dreamcast version is better due to everything everyone already said, but this is still good too.
The biggest problem with the game, the main reason it has aged is because the collision detection can cause the player to get caught up in stuff or fall through things. Because I have played it so much and know everything about it, I am more forgiving than the general populous would be if they were just playing this now. I can understand the problem though, it is so lame to boost into a corner only to stop, not slow down because you hit... The corner.
That said, anyone who says that this is one of the worst 3D Sonic games needs to STFU. In something like Unleashed and Colors, all of the levels play the same but have different art, but in Adventure, all of the levels have different gimmicks and different ways to get through the levels - Which are not always based on getting to the end faster, but to just explore or find new items. Sky Deck Zone is a good example of how every second of it is completely original to the rest of the experience, but none of it is cheap or hurt the game in any way, it is a blast, and it is not even the most diverse level in the game! Even the dreaded Big has a lot to do, and Amy is a lot of fun too. I do not understand the majority of complaints for her either.
That said, some of the glitches are cool and all, but it kind of makes it all too obvious as to what the game should have been. Who in their right mind would give Knuckles all of those cool exploration moves and not let him play the levels normally by choice? I can understand that it would make his stages too easy and they wanted to balance it, but still, it is what people wanted - And still want, it should have been unlockable or something.
Going to review it in a week and try to get all of the achievements in the meanwhile.
