I'd actually rather keep apt-get out of my games installation process. Obviously it would make sense for steam to call apt-get etc to install core libraries required etc. I'd rather not have some sort of dependency jungle whereby I have my system dependencies overwritten by some steam specific version.
The reason apt-get scares me for games is that it can sometimes get very carried away and start doing things like installing mailservers + alternative Windows managers + different java versions when I try and install a relatively small program.
Aye, and I wouldn't expect games companies to have the first clue about decent linux packaging. I say keep the games installed in Steam, but Steam installed with the package manager.
The reason apt-get scares me for games is that it can sometimes get very carried away and start doing things like installing mailservers + alternative Windows managers + different java versions when I try and install a relatively small program.