Among other, previously mentioned things I like:
The fact that when you install something, you can usually
get rid of it very easily - often all is placed in a single
directory...
-> No bloody "un-install" scripts...
(the few things sometimes ending up in Libs: annoys
me though, all extras stuff needed by the program should be
installed with the program itself unless you explicitlty allow
otherwise. Oh...in a perfect world...).
.
SlimJim