It was a wonderful operating system. It provided consumer desktop essentials (Plug & Play, DirectX 7, ACPI power management, Windows Driver Model (WDM), and support for consumer I/O interfaces like USB and Firewire) alongside a modernized UI, all running atop the NT kernel. I was extremely lucky to receive a free copy of Windows 2000 Pro as a student, because I rode that horse for years.
Then Microsoft added a green start button and dark blue backgrounds and packaged Win2k for home users as Windows XP.