Well I'm not against it. Day 1 DLC mostly consists of extra costumes, weapons and other stuff that doesn't really affect the game's experience, and games with those types of DLC usually offer their own unlockables.
Also, game development isn't cheap nowadays, so this practice is very beneficial to them especially for small companies like NIS (which I always see day 1 DLC for their games). It's better to release the DLC while the game's interests is at it's highest. The good stuff doesn't come out until a few weeks after the game's release - when most people end up finishing the game & probably want more.
With that said, I rarely buy day 1 DLC. The ones I bought were from my favorite series, but I didn't feel ripped off since I knew what I was buying and nobody forced me to.
