Funny Brakes... Is it this wear line any indication?

[azitizz]

Ive found my brakes are braking a little lightly once in a while. Its inconsistent but noticeable when it happens.

Its not that the car wont stop, its just as if pressing on the pedal with the same force as usual , I will give the impression of not grabbing as hard once in a while.

I was wondering if the wear lines on my front rotors, which were just replaced, along with new pads and new/rebuilt callipers, is any indication of something wrong. You can see the outer rings of the rotors are not wearing smoothly.

Is this kind of inconsistent wear normal? I'm a little surprised at how its wearing when the whole kit was replaced at once. The rotors became very rusted after one winter of driving... I Imagine that's normal, where the roads are salted like here. But is it avoidable?