The following is a direct reply to OP.
This is a cry to please, for the love of all that is holy, get your facts straight before ranting.
Firstly, Steam is a distributor. Steam began as a distribution platforms for Valve games, designed and published by Valve. Steam staff do choose which titles are distributed via the platform, but only in very rare cases do they refuse titles. Steam offers developers *and* publishers a chance to speak directly to the players for feedback and bug reports long after the game has been released.
Secondly, all of the games you mentioned have nothing to do with Steam other than the fact that you bought them from there. This isn't even taking into account the fact you are playing games like Max Payne and Commandos, which are games that were not built to run on Windows Vista/7. They may be available to purchase, but Steam can not take responsibility for bugs experienced within the game; they did not design it, and they did not publish it.
Here's something to consider, Mr McLeod; Steam sells you a product, and they take a percentage of the money you paid. The majority of the money goes back to the publisher. In the case of Max Payne, this happens to be Rockstar, seemingly a favourite publisher of yours. Now, if Steam had a refund system purely because "the game has game breaking bugs" (which, by the way, you would NOT get a refund for at a high street store), Steam will then have to give every single player back the money they got for SOLELY distributing the game.
Why not direct your hatred where it NEEDS to go and get at the publisher? It's like blaming BestBuy for your bugged copy of Modern Warefare 2 on Xbox 360. Not BestBuy's fault, is it?