I am used to previous generations where the use of internet as a means of distributiion were non-existent (I have never used services such as PSN or XBOX-Live before and probably never will). However am I missing out by buying a game that has DLC that I won't purchase?

Common complaints about DLC I hear are:

1. it is overpriced
2. the DLC content should have been included on the physical disc
3. it is not gameplay content (just cheat and aesthetic packages)
4. it only has a one time use/activation

So I ask is it worth bothering with DLC? Also is DLC region locked?