This video explains why people get hyped up and buy the new Assassin's Creed or Far Cry every year.
Apparently if there's new assets and a clear change of setting it's a new, exciting game that needs to be re-bought but if a game comes out with an entirely different design approach, but happens to use similar assets it's an "add-on"
It's the reason the die hard Bethesda fans don't like New Vegas. They see it like the guy in the video, just another Bethesda game by a different developer so they get to work exploring every inch of the world, scavenging, taking things back to their base and attempting to make their own fun. They get frustrated that the game is far more faction/quest based.
You needed to watch a video about it? I have explained it here many times already...
Fallout New Vegas is a great game, for 1 or 2 playthroughs tops. After that it gets boring and lame, because outside of the dialogue,factions, NPCs, there is nothing great about it. It is a chore to play because there aren't enough places to explore or shit to do. The game is extremely quest driven and it is very, very linear.
Obsidian with NV did the same thing they did with NWN2, they took the original concept and twisted it into a storyfag experience. Fallout 3 was a very open, exploration based, make your own fun RPG, and Obsidian turned it into a storyfag quest and C&C heavy game. Neverwinter Nights was essentially a single-character-create-your-own-module-for-multiplayer toolset that Obsidian attempted to make a party based storyfag CRPG out of.
Don't get me wrong, this approach is not "bad", but it does detract in some ways from the original experience. It is very hard to make an openended exploration based storyfag game. Imagine Minecraft, can you even imagine a linear storyfag campaign within Minecraft game? You can't... If you add this type of element in a game, it can't be "make your own fun" anymore. It puts limits.
To better illustrate the problem from a Bethesda-fan perpective, imagine our frustration when every time we want to make a new build in new vegas, we have to make the U turn Primm-Mohave Outpost-Nipton-Novac-Freeside-New Vegas. Every fucking time, doing the same quests every fucking time, because they give a lot of exp and loot and it only makes sense to take them in order. It is frustrating to try to level up without doing the quests because they provide HUGE EXP, and doing the story quests implies watching the same fucking dialogue and clicking the same fucking options every single time... It is boring...