Windows games worked great on Windows 2000! There were officially inofficial packages of DirectX and such - I never had any trouble with them.
I think DOS games also worked.
Wow, ancient memory unlocked. Grabbing and ripping the DirectX releases. Word.
There was nothing unofficial about it -- Windows 2000 had full, official DirectX support parity with Win9x.
Windows XP is where Microsoft themselves pushed the consumer market onto the NT line, but Windows 2000 was fully functional as a consumer desktop.