The whole reason the "sense of entitlement" is there is because it's a well known franchise, especially well known for good quality. Bethesda has set a certain bar with each game, they did it with their first, their second, their first foray into consoles and their first big blockbuster on current gen consoles.
When a company sets a bar like that the populace begin to expect, or "feel entitled" to a certain level of quality, it's basic human nature and it's basic business. If you put out a good product the public is going to expect you to keep putting out a good product. As a designer myself I must adhere to a certain standard I set, especially if that standard is well liked and expected of follow up titles. Why do you think BioWare got so much flak for Mass Effect 3 and Dragon Age II? Because the standard the company set for themselves with prior games wasn't hit in the eyes of the community, or even some community. The community who paid their $60 thought they were going to get a game that measured up to that previous bar at the very least.
You're mistaking "entitlement," or rather those who say things like "I should get all DLC for free because I already bought the game," for the entitlement that comes due to expectations. I don't expect Bethesda or any other AAA, AA or indie developer to change a game because I ask them to, I don't expect them to listen to my criticism and take it to heart. What I do expect is a game, especially one in a franchise as big and as historic as TES, that measures up with previous games. We have a right to expect that as a consumer because that is the standard that was set, that is the reputation you are billing yourself with.
Expectations and entitlement are two different things. There are people that expected better and there are people who got exactly what they expected.
Please look at the long, long history of games, especially franchises. Mario has a certain expected quality. Zelda has a certain expected quality. Final Fantasy, Pokemon, Gran Turismo, etc, etc. Let's take one of the biggest debacles in gaming history, the Zelda CDi games. The Zelda name was on the package. People were expecting a game that matched the same level of quality that made that name mean something. You actually think people are in the wrong for expecting those CDi games to have been good and you actually think it's wrong for them to have been outraged that they were so terrible?
Hell, let's not even use such an extreme example, let's use a tamer example: Resident Evil. RE set the standard for survival horror games, but what happened in RE 4 and 5? It slowly drifted away from the survival horror roots and became an action/adventure game. They were still
good games, but the standard and expectation of survival horror was gone and people have a right to not be happy about that.