It’s one thing when you have “freemium” games that make up for free or really cheap installation & gameplay in exchange for several layers of optional(ish) premium DLC. It’s when a full price or near full-price game feels incomplete without the DLC that I have a problem. I’ve managed to stay away from most games like that – it still feels like those have been the exception rather than the rule.
But here’s what it has really done to me, marketing gurus of the video game industry: It has really, REALLY encouraged me to not be an early adopter of games. When I know (or strongly suspect) that the cost of the DLC will add up to be far more than the original game, it encourages me to wait for a lower-cost, “gold” or “platinum” or whatever release, where I can buy what feels like a “complete” package at a discount. I rarely buy a (mainstream) game new anymore. I feel like the game won’t really be complete and fully released for a couple of years, once all or most of the DLC has come out.