Day 1 DLC I have a problem with as it is mostly a form of Piracy protection, or extra income. Later DLC is a gift, yes, but day 1 DLC is content that could have, and in my opinion should have, been released with the game itself.
It is one of the two main ways companies try, rather unsuccesfully, to defend against piracy these days. One is to give the players part of the game, aka: The main game, and release Day 1 DLC for free for those who purchase the game, and those who don't, don't get the full game. Now, this would be an alright strategy if You only had to register the DLC once, and not be online for the rest of the time, which some games do, however, there are also games that require you to be online whenever you play the game if you want your DLC to work, punishing players who do not pirate, as this problem would likely have been removed by pirates to be able to play the DLC offline.
The second approach is free updates if you purchased the game, and is, IMO, a better way of doing things. Depending on what you update, and how you hide it, Pirates could have to potentially download the entire game again, or if its not a large update or is well hidden in the portions it updates, they would just have to download an illegal version of the update. These updates sometimes include extra content, balance fixes, bug fixes ect. Usually based of user responses to the game. Also, you usually don't have to be online to use the update, only to install it.
This method seams to realise the futility of fighting piracy, and seems to accept it, whilst at the same time counting on the laziness of some 'crackers' and the pirates want for the higher quality version of the game, to reduce piracy.