I am not against costume changes if i like them (which for everyone will be in their opinion of course). It makes sense in the new 52 at least that since the past was changed slightly, it would change some of the choices they made.
Ones i liked: Superman (although i do miss the undies), Green Arrow, Harley, Hal jordan.
Ones i hated: STATIC. (As a static fanatic i didnt like it, the symbol was ugly, the suit didnt seem interesting)
the rest i didnty have much of an opinion on