That's normal for a 6 speed manual transmission, but a PDK has a 7th gear which would run at 2500 RPM at 75 MPH. Don't sweat it and enjoy the ride, but use full synthetic oil (5-40). Note that 3000 RPM is not even half way to red-line (7200 RPM) on the new A91 engines (2009+). On the earlier M97 engines, it's still only half way there.
Best driveable torque is at about 4,000RPM, that's why they put it at the top. You don't really have to look at it during spirited driving. Below the top, shift down, above the top, shift up. Easy. 3,000RPM is perfectly fine for cruising.