Desktop Environments give you a bunch of programs, GUI configuration tools, different services which all make DE like an OS on top of OS. Of course it works slower and less stable and just doesn't feel right overall. Window Manager just gives you windows and sometimes panel (like IceWM, but OpenBox doesn't). Plus some other tools to manage X.org windows, that's basicly it. You have to do all configurations of OS yourself using CLI and text config files. And also WM is configured with text configs which sometime is pretty difficult. If you wanna try a WM, check out IceWM first. It's very easy to configure compared to some other.
Last edited by Mr. Alex; 09-03-2012 at 04:31 AM.