Same here.
As you say, characters always change. But so many seem stripped of their core. The point of loving a character is something about their personality being distinct to them. How they sound and act are what make the character. That might change somewhat depending on the context of the story; being more or less serious, for example. But, at a certain point, they stop being the same character and become someone else.
The New 52 is just rife with these complaints. Forget continuity and origin stories. Somehow DC ended up contradicting the core of so many characters.