Sonic the Hedgehog 4!?!?

I stayed home from school today and came upon Sonic the Hedgehog 4 on the playstation store. When i was a little kid, I would do nothing but play Sonic the Hedgehog 3 and Knuckles on my computer so I decided to give the 4th game a try. After the download finished I started playing it of course. The graphics were great but the looks were very different. It didn't look anything similar to the other games in the series and the game felt a bit slow. After playing for a couple of minutes i said to myself, "This isn't Sonic." I then preceded to quit the game and delete it from my PS3. I wasted about $15 only to find that the Sonic the Hedgehog series was ruined...