There's no other kinder word to describe someone that thinks beating a raid 2 times should net all their gear. If not they are quitting. When someone thinks they should be handed something they are entitled.

What do you call people who buy a game with their own money and want to enjoy playing all of it?

Entitled. The game is made for the masses. Not that individual person. Entertainment is different than other industries. What do you do if you watch a movie and don't like it? Your not getting your money back. They are not going to change it. Maybe listen to reviews before getting it? Maybe do some research on how past movies have played out in that genre. Edit: I also want to point out that this type of genre that Destiny is requires work. All RPG's and MMO games require work and grinding. If this is new to people I understand. But do some research and look back at past games in this genre. You will look at Destiny in a new way since there are even harsher restrictions and grinds out there. Some games will require work to be put in to earn things. This isn't COD where all you have to do is level up to be guaranteed items. That's not how this works.

Imagine buying a movie on Blu-Ray where you only get to see some of the movie while others who buy the same movie get to see all of it. Are you entitled to see all of it too?