I review the Sonic Gems Collection, and it gives me pause vis a vis the whole 'repackaging classic games' thing:
"Sonic Gems Collection basically dares its audience to ask one question: does merely being old qualify a game for 'classic' status, or did the game have to be good in the first place? Sonic Gems offers three previously unrereleased Sonic games, as well as eight other 'bonus' titles, bringing the grand total up to 11. This shotgun approach is actually the secret of the title's success, because while the three marquee titles are a bit of a letdown, a few of the lesser titles are interesting and fun enough to make the game worthy of a look."
The various games are discussed
here.