There is a layer break also for pressed discs. When you read a DL pressed discs, the original layer break can/will be saved in the .mds file.
Most Movie DL discs have the main movie on the sectors (part of the disc) where the potential layer break occurs. So if the layer break is to be in the main movie (or in a movie part) the star is poor.
Try to build from a Disney DVD or a DVD with several short episodes and you'll see the "good" stars also. The better stars are in the parts where in doesn't have to cut in the movie parts, but instead between physical files.
In theory if your stand alone player supports the seamless option, you will never notices a layer break in a movie part.
What's the brand of the slim line drive?