The emulation for the Switch version at least is just lousy, with some horrendous input lag that makes some games nearly unplayable if you're used to how they play normally.

Stay away and play the SEGA AGES versions, or the Mega Drive NSO pack if possible. M2 handled the emulation for those and they are a much better preservation effort than whatever this is. Quantity doesn't equal quality, these games deserve better than this.