I still buy all the dlc, but I would utterly and completely pay more for it all at once, and with more thought put into it.
I don't want a suit, I want pieces so I can make a suit myself, I don't want a non customisable car, I want features I can put into cars to create combinations and different types, release presets for those who are lazy, but then allow them to edit the bits and pieces. I don't want a mission pack showing what could have been in the game, I want expanded story and things that are actually in the game, not to mention, cutscenes that don't deform my female character and make me go "Shes Smart! She wouldn't say that!"
I would love extended work with npcs interactions and romance options, I would love to have more in the open world and activities to be integrated into it, if you get a tank, get tank mayhem, sign up for mind over murder, have more then just timed race missions, hacking minigames and activities where you just shoot the area around you (things blow up! LOL) Have a reality climax friggin editor, have more community integration with steam to allow for easy downloads of others creations. Maybe have new music on stations. Have it all released at once for a higher price instead of releasing bits and pieces, whats the point of new clothing if theres nothing to do while wearing it. Mabye have a matchmaking system where you can send global text messages to play with others. Gahh so much potential!
I'm sorry, and I'm almost definitely asking for to much, but a game is a lot better than you actually want to give them money to support it, it doesn't need the best graphics, but refine textures or allow the sdk for improving textures for those with a good enough pc.
Take your time and don't rush it, don't get something out quicker if its not going to be as good just.... take something from my rant okay?