A friend wanted me to pick up Dead Space 3 so I could play with him, but because of the sheer amount of DLC for it, I simply declined.
If I see the filesizes for whatever content they are selling as 108kb (ie, already on disc, I just need to pay to unlock them) that immediately shies me away from a game.
I have no issue with buying a game with available DLC. Rock Band 3 is one of my most played games. Battlefield 3 as well. Even Skyrim with it's fairly expensive expansions didn't. It's just a case-by-case thing, I guess.
The constant DLC practice is what stopped me from buying new releases finally. I was the guy for years who had every new release pre-ordered; usually collector's editions at that. Once games turned into $60 for the game plus $20 of Day 1 DLC, with another month of held-back content priced at $10 a piece, I laughed and walked away.
I wait now until most games are $20-$30, and then only grab DLC when it goes on sale for half off. The cost of one game and content shouldn't exceed $60.
The Wing Commander series is my favorite of all time. 360/PSN: ParadiseRegaind Bnet: ParadiseLost#1366