OEM pads are not always the best pads.
a lot of them are lower quality ceramics which are to soft, as to provide less dust and brake squeal, which is one of the #1 warranty issues. as for braking power the ceramic won't handle the heat as well as a metallic.
some aftermarket manufacturers try to balance things out, and it sometimes backfires on them. I sell Raybestos pads, and I won't use them on my own car.
I prefer the Monroe Friction pads, which have 40% less glues & resins in the material, they are positive molded and pressed to the backing plate of the pad. There is no break in required as with other pads.
What really helps is a high temp synthetic based brake fluid, 550degrees and higher, Wilwood is my favorite. You will notice a difference in braking.
I've seen my wife and her family eat through OEM pads from mitsubishi, toyota and nissan. When I replaced them with a quality aftermarket pad, my wife wasn't able to eat through in 14 months, she's now onto her 3rd year, as are my in laws, which have doubled the longetivity. And they haven't stopped driving like maniac's!