Why is that? Steam svcks, it interferes with other programs and causes crashes of other applications.
I've been using Steam continuously since Half Life 2 came out (wow,
six years now!). Currently, I have 68 games which I have purchased via Steam. They range from the "simple" (Peggle, Bookworm, Bejeweled), to the processor intensive (FO3, FO:NV, Call of Duty series).
I have
never had Steam cause my computer to crash, freeze, or any other "bad" thing while it is running -- which it is from the moment I turn on the PC. And this is on a PC that I built quite some time ago, by gaming standards (3+ years, I believe) and one which has now run Windows XP, Vista and now 7.
One of the other things I love about Steam is this: When I do build a new rig, I don't have to manually reinstall anything from disc (heck, I don't have or even need the discs). I can simply re-log onto my Steam account, and have Steam reinstall the games for me. In fact, I keep older game
uninstalled now -- and have Steam reinstall them when I feel like playing an older one.
Another great thing: I don't have to worry about patching. Its done for me.
Yes, it has its flaws, most notably server overload (downloads may stall out when a new game comes into the store).
However, I have
never seen it mess with any other programs, nor have I ever had it crash other applications.
(OK,
one caveat... I cannot have the Steam overlay active when trying to play Call of Duty 4, or the cheat protection system (PunkBuster) for COD4 will kick me out of a game. However, that is NOT a Steam issue. That's an issue with PB not allowing overlay programs.)
The fact is that when a game crashes (or whatever), it is the game, not Steam, that is at fault.