OK, so, I've actually played this game now through an emulator (Wii emulation is surprisingly fast!), and I've got an actual opinion now. Actually, I've pretty much had one since the old beta videos of this, and the sad thing is that my opinion hasn't changed at all since then. First off, something positive! I have to admit I like the level design a good bit more than I thought I would. There's actually a good bit of new gimmicks in such in the old levels. And even though it's basically a mini-cutscene where you have to watch Sonic run around in the background for about 10 seconds, I like those card roads. Hey, Death Egg in S&K did it, so they're allowed.
If there's anything that's a complete and TOTAL deal killer for me, it's the physics. I'm sorry, but there's just no way at all you can defend them at all. There's pretty much no momentum or natrual way to build up speed, and pretty much any trick you can do in the Genesis Sonic games, like, say, building up speed by rolling up and down a U-shape? That doesn't work here. Plus there's the fact that they basically plastered speed boosters everywhere, which really only serves to basically cover up the crappy physics. You can't even really JUMP right in this game, because when you change directions in mid-air, you basically kind of 'snap' your momentum instantly in the direction you choose. It just comes off as really stiff.
And yet everybody will gleefully ignore all the problems in this game and give Sega no complaints to actually fix them for Episode 2. Oh well, let the hacking commence! We just need a complete physics rewrite, a completely remastered soundtrack, less speed booster, and we'll be on our way. I'll still be playing through this, but I know I'm probably not going to bother buying Episode 2, either.