Goat of Christmas Past wrote:
3 and Knuckles were good. But I never liked 'em as much as 2.
First one is rubbish. You can't even spindash. Or can you? I can't actually remember.
No, you can't. Thus, there is an emphasis on skillfully preserving your momentum whereever possible. Sonic 1 also has longer "zones", which each area consisting of three acts, making it, by any measure, the more substantial game.
Though, judging by the art they used in-game, Sonic CD appears
to be based on Sonic 1, and does has a spindash-style move.
Arguably, it is the relative ease with which Sonic 2 can be finished (and the ability to bring a friend with you while doing so!) that makes it the more fondly remembered game. Nonetheless, Sonic 1 IS finishable.