20 already? xD sonic is half a year older than I am. The first three games have been classics the whole time and unlike most people, I actually enjoyed the storybook games on the wii. It was a different take on sonic and it wasn't anything like the 2D games, but it actually did have some elements I enjoyed.
Now to avoid a flame on my ass, I'd say: keep in mind what you did with colo(u)rs sonic, and you'll be whizzing past the medicore mark in no-time because that game was the most awesome sonic game in years.