I played ADoom on my 030 equipped Amiga 1200 yesterday. And it played just as good as Doom played on the PC back then.
IF Doom had been released for the Amiga at the same time as on the PC, I do think Commodore would have lasted longer and perhaps gotten enough money to get new chipset and stuff out. Doom sold PC:s!
Doom was probably the one and only reason that killed the Amiga 1200 so fast. Everyone I knew switched from their newly bought Amigas to PC when it came out...
Oh well.. playing ADoom made me somewhat angry about everything. Impressive version, but it makes you sad too when you think about what would have happened if it was released on the Amiga too...