Couldn't go with just three... lol
1) 2-button mouse (the original Amiga mouse is still my favorite)
2) DMA for the already fast SCSI
3) Kickstart in WCS or promoted to 32-bit via MMU and protected
4) Amiga RGB monitors having amplified speakers built in (especially stereo) and composite video input
5) classy case designs (especially A1000 & A3000)
6) "plug and play" architecture for the most part (until you start asking a lot out of your machine anyway)
7) Keyboard garage of A1000


Innovative software from both Commodore and 3rd parties
9) Hardware and software support for the emulation of several other platforms
10) AmigaOS! any flavor, take your pic
