Finished Sonic 3 a while ago. Had been playing it for a while, and some days ago finished it.
Really liked the game! The first 2 games feels kind of immortal, in a way. Just so memorable and really 2 classics. But I think the 3rd maybe the best gameplay-wise. I really like how I think the sonic games improved game by game. Adding features that made the games more fun. In sonic 3, there are different bubbles-power-up (spoiler), which I think is really great improvement since the 2nd game. And great stages as in any sonic game. The only issue I have is how you have a time limit on the final boss (spoiler again I guess :/). It just feels so anti-climatic losing on time on the final boss.
But other than that, the game is great and really fun! :D
Definetly recommend it!