My list for the worst Amigas ever would have to be the following:
Amiga 600
Amiga 1200
Amiga 4000
Amiga 4000T
AGA was a selling gimmick that Commodore used to sell these low quality Amiga models. They wanted people to move away from the then popular, higher quality Amiga 2000 and 3000 Series. The lower quality Amiga 600 was meant to replace the higher quality Amiga 500 (Commodore's most successful Amiga model). Commodore could no longer afford to produce the high quality Amiga 2000, 3000, and 500 Series, so they were pushing the sales of the lower quality Amiga 600, 1200, 4000, and 4000T. People in America quit buying the Amiga because of this.