I've just launched it a few times in my emacs days, it seemed pretty powerful as the documentation suggest : http://orgmode.org/guide/index.html . I may be getting something wrong, but it do not look like just "edit todo.txt + cosmetics" to me.

For example, if I understand correctly C-c a a (http://orgmode.org/guide/Weekly_002fdaily-agenda.html#Weekly...) compiles an agenda. I'd rather have a small program to do that and launch vim on each todo like mutt for writing emails than having it bundled in my editor.

Edit If I were using emacs daily, I'd gladly use org-mode :)