Luger triggers are among the most complicated linkages that you'll ever find in a gun.
There are more moving parts than are really needed, but having said that, if you practice, it certainly can shoot accurately. They never will have the "breaking glass" feel, and they're not much good for modern "combat" shoots. The P35 Browning, still in use by CDF also has a complex trigger, but nobody seems much concerned about it. The Luger is an example of late 19th century design, where thinking was concentrated on the action and not the trigger. The real problem with Lugers is that many of them are very ammunition sensitive. But they're iconic and just neat guns.