This is the biggest BS I ever heared.
The main purpose of Steam is to provide
- a digital distribution platform
- enable multiplayer communication
- enable match making
and *drumroll please*
- provide DRM (= binding games to a Steam account) to those companies who use
it !
Not all but unfortunately the majority of games available at steam feature
DRM.
But there are games such as Dungeons of Dredmore which work without Steam,
where you can simply copy the game somewhere and play it.
Desura could never keep up with Steam. They rarely have "big titles" and are
often way behind Steam in providing / distributing games.
Everything else is just hear-say