Sure Streetfighter II and Mortal Kombat were going to be compromised with the 1 button Joystick, but they could have coded for Sega Genesis pads too. Lack of effort, and graphically SF2 is a half hearted effort compared to the me-too clone Shadow Fighters.
But the fact Lotus II on Amiga and Genesis look identical, but Outrun on Amiga looks like a steeming turd with steel wheels is a joke, it should have looked as good as the Genesis version or even the NEC TurboGrafx.
And the PAL problems some people had in NTSC land, here in PAL land most games had a massive stupid border on the bottom of the game due to it running in 320x200 not 320x256 PAL mode, and to make it worse still some games like Buggy Boy just used the graphics designed for the ST version, so the Amiga buggy is squashed. FAIL!

I suspected it was probably due to the NES, was very big seller in USA. In the EU it pretty much flopped, most consoles did until the Sega Genesis.
It's still a shame though, a real shame, apart from conversions of technically simple arcade games we got pretty shafted. Thank heaven for such ingenious coders as hired by people like Gremlin for things like Shadow Fighters and Lotus II

These games clearly show technically the Amiga wasn't the problem causing the rubbish conversions.
Early games were much better, look at Marble Madness and Cinemaware stuff from the USA, truly beautiful efforts if not execution which you never begrudged paying 2x as much as a C64 disk game to play. Then it kinda went down hill I feel as the big boys got involved.