This is how you celebrate Sonic's 15th anniversary?
The graphics, although better than most previous Sonic games, could be better. The environment is colorful but there are certain areas (not that many) that are un textured, such as the few buildings that disappear if you look at a certain angle.
The gameplay is the game's strongest quality. Most of the characters were fun to play as, especially Shadow's. Silver is also really fun, he added a new way of playing with his telekenesis. Some of them, however, take some getting used to like Tails. The gameplay, overall, is really fun though.
My biggest complaint for this game is, of course, the load times. There are just too many and most of them seem very unneccessary, especially the town missions. Most of the load times take about 20 seconds to load. Some of them are quick, but not many. It's especially annoying when you fail a town mission because then you have to sit through another minute just for the game to load.
I didn't think glitches were that big of a problem. The biggest glitch I found was the fact that you can't jump off of walls very well in Knuckles and Rouge's levels. This can get a bit annoying (unless you can just climb to the top or bottom of the wall).
In conclusion, Sonic the Hedgehog (next-gen) may not be a Genesis Sonic game, but it still is pretty fun minus the load times. It isn't worth $60 though, it's worth more like $40 or $30. It is worth at least a rental and it definately deserves more than a 4.4. If it were only finished, it could have surpassed the Adventure games, it can be quite fun.
UPDATE: I actually gave this a decent review? I'll have to rewrite this some time.