At first, this seems like definitive package. It's not hard to see why that is, either. Widescreen support, Beautiful remastered cut-scenes (amazing work as always, Triangly!), some lore fixes (being able to use Super Sonic in the first zone was a nice touch!), and even some extra sprites thrown in as well (Sonic be lookin' SMOOTH!)!
So, why isn't my rating higher?
Well, let me address the elephant in the room,
The Boss difficulty.
For some reason, the bosses were changed from the previous versions. While that seems to be a neat idea on paper, in practice, the changes were for the worse, not the better. The Storm Station Boss is a prime example of this (in my opinion). Even after the 2.0 patch, some of the boss patterns and projectiles are so stupid hard that after I beat the game, I felt like I never wanted to replay it. I'm not the only one with this opinion, either.
A minor nitpick as well is the physics changes, while I have no problems with the normal ground physics, while you're underwater, however, it feels like you can jump into the stratosphere! It just doesn't feel right. Again though, it's just a minor problem.
So, in conclusion, while I like the IDEA of this version, I simply CANNOT recommend it over the previous ones. Especially to the people who have never played After The Sequel before. The bosses are really frustrating sometimes, and they just don't work well in my opinion.