The Amiga couldn't have been designed to compete against the Megadrive and SNES since they didn't exist yet. In the US, the Megadrive came out in 1989 and the SNES I think in 1991.
So it's okay if they beat the Amiga in some respects. They're newer.
It's sad that the Megadrive versions of many Amiga games tend to be better technically. Although I'd chalk that up to programmers doing a straight port rather than taking advantage of the Amiga's copper and blitter. The Amiga versions could have been as good, or better.
The same thing happened with the Saturn and Playstation. Saturn versions of many PSX games were straight-through, barely operational ports, whereas 'native' Saturn games pulled some absolutely amazing tricks out of the (arguably superior but much harder to program) hardware.
