If anecdotal evidence of a possible breach of copyright law and a single admittedly poor security policy will keep you from using gamersgate, I have to ask why you would use any online service. Steam has several questionable policies, not least of which would be their refusal to give any sort of refund ever for any reason, even if the game you bought does not work or if the purchase was made fraudulently. Or the fact that they will ban your account if you reverse a charge on them, even if the charge was fraudulent and reported as such, which of course locks you out of all of your purchased software.
Direct 2 Drive has several games which they simply refuse to patch, either because those patches remove DRM or because the games are deemed 'too old' and are not economically worth patching. d2d encrypts large portions of downloaded games to keep you from 'pirating' them, which severely restricts modding support and makes the game itself run worse than normal as it must decrypt data files prior to use each time it load. I won't even bother going into their draconian DRM policy.
Gamersgate at least has a moderately light DRM policy, allows you to back up the installation files to your drive (which steam and Impulse do as well, but it requires the steam/impulse installer running to install from those backups), and generally has pretty good deals.