Yes, this is normal for many guitars. The pick-ups have been designed to follow the curve of the fretboard, so as to have the same height between magnet and string. Is it important, or critical..? Not at all; it's just the way that particular manufacturer thought would sound (or sell..!) better.
The traces of rust are normal, too, as the pole pieces are made of ferrite (so iron...) material. A brisk rubbing with a Scotch-brite pad, or a brass wire brush will remove it, and applying a little varnish (clear nail varnish..?) over them will help keep them rust-free. It's purely a cosmetic thing, though; personally I just accept it and leave 'em alone.