Well people have been complaining about DLC in all forms since it pretty much started. The reason on-disc DLC is particularly derided is that it is seen as even more of a cashgrab. When you think about it, it's really the developers/publishers/whoever telling the consumers "yeah, we actually had this part finished but we know you're suckers who'll pay more for our game".
DLC that comes out a week or so later feels like something the developers didn't have time to complete, but wanted to get into the game anway. It feels like the developers went to a bit of extra effort with the game to give the best possible experience to the player.
Your examples are kind of flawed, by the way. The difference with Super Mario Brothers is you don't have to PAY to unlock the remaining levels; they are unlocked through gameplay. Also, show me a CD where you have to pay to unlock an additional song on the disc and I'll call that a valid argument. Although all you're really doing is saying people who don't like on-disc DLC condone piracy.
DLC that comes out a week or so later feels like something the developers didn't have time to complete, but wanted to get into the game anway. It feels like the developers went to a bit of extra effort with the game to give the best possible experience to the player.
Your examples are kind of flawed, by the way. The difference with Super Mario Brothers is you don't have to PAY to unlock the remaining levels; they are unlocked through gameplay. Also, show me a CD where you have to pay to unlock an additional song on the disc and I'll call that a valid argument. Although all you're really doing is saying people who don't like on-disc DLC condone piracy.