What games are you a fan of? I don't see all that much difference in most games that continue a series.
Uncharted is my favourite series of all time but really besides refinining gameplay and changing a story/cinematics.. what did they do? Last of Us might be my favourite game ever and it's just Uncharted with a new skin and a very light crafting element.
95% of games aren't very original or borrow greatly from a predecessor. And maybe some sports game rarely change, but even a ton of little animations being refined or added are huge for a simulation.
You're talking extremely broad gameplay elements. Every first person shooter or 3rd person platformer plays differently and offers their own twists or upgrades, they are not the exact same game with the names changed.
Even if I accept your logic, that every game is just as much of a reskin as sports games are -- a huge stretch but whatever -- I don't buy these titles every year so I don't see the contradiction.
In fact a company like Nintendo is known for releasing only one or two Zelda or Mario game per console generation. Even if I accepted that every single one of those games are the reskins, they aren't released every year.
Even Uncharted isn't released every year, in fact there was almost a 6 year gap between 3 and 4.
To answer your question, I like enjoy most of the big releases, I like far cry, I like uncharted, I like madden, I don't feel any need to buy them every year though.