Yes, Jack Tramiel was not exactly a hero in Atari circles. But in a way, you could say he saved Atari from 1984 oblivion by buying its consumer division from Warner and carrying on the product lines, even if he and his family did mismanage them. Regardless of that, may he rest in peace.
I'm not sure I like the idea of ranking people's deaths from less to more important. Whatever your feelings about Apple (I'm not a fan), Jobs had a tremendous impact on society, and so did Jack Tramiel. Actually, Dennis Ritchie's death a few months ago made me realize that we're right at that point where a lot of our heroes (us being computer nerds) aren't going to be around for much longer. No doubt new ones will take their place, but there's no real replacement for those at the forefront of the personal computer revolution. Rest in peace, Mr. Tramiel.