Dear Microsoft, if you want to win me back to PC gaming, great, I'm here to be won. I have money in my pocket, am about to have considerably more free time, and really miss gaming with a keyboard and mouse. In order to help you achieve this aim I have written you up some helpful tips:
Commandment Number One: Firstly and most importantly, you will make some PC games, and the PC games you make will be good. I expect games to be fun, original and well paced with decent controls, thoroughly tested to resolve bugs prior to release and long enough that I don't complete them in a single day off.
Commandment Number Two: The games you make will be complete. This is nearly as important as Commandment Number One. I will not pay £50 for a game at release only to have half of the actual game walled off as "optional" DLC to purchase separately. DLC should be something extra that enhances an already complete and satisfying experience. See Skyrim if you need further clarification about how this might be achieved.
Commandment Number Three: You will make games for PC gamers, not just port console releases. This one should be a no-brainer, but, as I am addressing a company that thought an always-online console (don't worry we will salt that particular wound shortly) was a good idea, I think I should probably play it safe and spell it out for you. One of the great joys of PC gaming is it's diversity. I love FPS, survival horror games, adventure games, platformers, but I can play all of those on my console. If I am going to come back to PC gaming I need to be coaxed back with games I can't play (at least not well) on consoles. Give me grand-strategy, complex RPGs, give me the kind of games where the majority of the keys on my keyboard will actually be needed.
Commandment Number Four: You will ship PC games without DRM bullshit. Nice and simple. No bloatware client, or Steam Authentication, nothing. It's stupid as fuck, it doesn't work and only serves to inconvenience the gamers who didn't pirate your game. When I buy a game I want to take out the disc, install my game and then play it. No 3-hour bullshit cycle of "download client, install client, install game, register game with client, download mandatory updates, install mandatory updates" before I can even get to the title screen.
Commandment Number Five: Always-online will go fuck itself. While this should be inferred from the above, again, I thought I should air on the side of caution and make this crystal clear: Nobody wants this. You aren't enhancing anyone's experience by making games always online and there isn't any benefit to being online that can't be realised by giving people the option to connect online if they choose to. And stop telling us it's for our own benefit, we aren't that stupid and we don't believe you. Just because you take something people want and make it always-online, and then some people buy it anyway, this is not evidence of demand for always-online, it's evidence that people wanted the product enough to put up with always-online and nothing more. MMOs obviously get an exemption from Commandment Number Five - See Commandment Number Seven for details.
Commandment Number Six: Lastly, the games you release will be the games you promise us. Trailers must show actual gameplay footage, functionality must be as described in the advertising and on the box and play-time must resemble the actual amount of time it will take me to complete the game. Behaviour contrary to this is dickish and best, and it many cases constitutes straight up mis-selling.
Commandment Number Seven: MMO development will will go fuck itself. Development staff proposing MMOs will be fired and discussion of including MMO elements in other games will be a disciplinary offence, with repeat offender to be placed in a giant slingshot and fired from the roof.
So there it is, not as hard as you might have thought. Now you have some work to do Microsoft, best get to it...