Alright, so stepping into this game I had a part of me that felt I might not enjoy like I once did due to all this negative response from those who originally disliked the game and stated what they saw as flaws. When I first started playing, (I picked Team Dark first) I noticed something was a bit off about the controls and it was bugging me a bit, so I went and turned on my Gamecube to test it out and the controls felt a lot better for some reason. I'm not sure if it's due to the Gamecube controller itself, or if they changed anything, but something about the original feels better. Although, when I say something felt "off", these controls are still great to this day.
So anyways, I played through the first two Eggman stages, and when I got to the second one I realized why I like the mech stuff in this game so much. They are like the Gamma stages yes, but they have a lot more platforming in comparison, and it's really fun to me. As for Rouge, for those who aren't use the treasure hunting, I'd suggest running into Omochao or the TV Monitors if you're getting confused, but for me I breezed right through the first two levels. I played Sonic Adventure DX last year again, and even now I still appreciate the difficulty these treasure hunter stages have in comparison. I feel more inclined to try than to just fly and have everything on a silver platter.
Now, when I first got to the main course, (dem hedgehogs) I felt this overwhelming surge of satisfaction. Really, Radical Highway is just so awesome, and the music, level themes, level design just seems like it was catered just for my tastes. It was when I just played that level that I realized how much I really do like this game. I haven't messed with the Chao yet as I don't want to do too much progress in the gardens before the PC release.
As for complaints or downsides, believe it or not, my only issues are the same issues I had when I first played the game for the very first time except for one.
Previous issues:
Unlike Sonic Adventure, you are forced to play things in the game's order and not your order. I liked how the first game let me just stick to one type of a gameplay at a time.
This game never was known for it's cutscenes, even at the time it came out because they just aren't done too well. Some are good, but most of em are awkward due to the graphics and animation used, and they hold up less than they did then.
New issue:
One that didn't bother me before that I noticed now is the camera during the treasure hunting stages. It's not terrible, but it could be zoomed out more, and it'd be nice to have more control of it. It's more of a slight annoyance, but nothing major.
Verdict:
Game controls great, music is AMAZING, gameplay is great, and overall is a great game and still to this day is in my top 10 favorites of all time.
I'm not sure, but it seems like they added some new textures to some of the things in the game like the turtle in Rouge's stage. I heard Xbox 360 is dark, but Sonic Adventure 2 HD is quite darker for some reason so it may be that. Oh, and so far no issues with the homing attack.