The rust is normal. All of my cars have surface rust on their rotors, but it gets cleaned off when you drive. If it's not, then try braking really hard (on a quiet street with little or no cars to be safe), and see if that cleans it off. If it still doesn't, maybe your pads need to be set?
I think you can turn off the car, and pump the brake pedal until it gets so stiff you can't push it anymore, and that should reseat the brake pads in case that's what it is.
'94 Supercharged E36 325is (150,000 original km's)
-Vortech V9 G-Trim @ ~10psi w/ BOV
-255LPH Walbro fuel pump
-TEIN SS Coilovers w/ Pillowball mounts
-Keskin KT1 17x8.5 & 17x10
-Remus full catback
-Authentic Rieger Infinity I body kit
-SMT6 EMS (Untuned)