I LOVED DOS! The worst thing MS ever did was make the OS dependent upon the windowing system. Can you imagine NTCMD and all it can do if you could boot directly to it?
Then you'll probably really like Windows 8 as well. It comes complete with "new" metro style full-screen apps that are hard to figure out how to shut down or put in the background so you can run something else at the same time - JUST LIKE DOS!
Talk about a regressive OS. Win8 has come full circle back to DOS days.