I can answer that since I've pretty much had PC's running concurrently with an Amiga of some sort.
The problem was with your IBM PC's which were specced ultra conservatively to be uber-reliable office machines but that also made them lousy gaming systems.
My EGA AMD 12Mhz 286 ran wolf3D as smooth as silk.
I got Quake playable on a overclocked 50Mhz 386DX40 with a very overclocked Cyrix FPU and decent SVGA graphics card.
Doom, ROTT and Duke Nuke'm 3D were smooth as silk on that system and better then the 486DX33 I had after until I installed a VLBUS graphics card and a DX2/66 CPU.
It just got better from there on... so many options, so many games.