
Grease
They've greased there fingers with 95% of it, abusing open source and open standards along the way...
Bad I.N.T.E.L.L.I.G.E.N.C.E - intel chips with hidden "Me" controllers and poorly documented power management features. Below par AMD chips along the same lines with PSP microcontroller with again closed source drivers and binary blobs. Crappy firmware, with persistant hard-disk drive infectors, I've got one of those disk's and contrary to persistance or there claims of persistance you can over-write the UEFI boot sector with your own boot-loader.
I rarely find myself having to shout "Unclean - Unclean!" but it does happen more often than not with Microsoft crap.