A chuck roast is a good cut of beef for a slow cooker pot roast. This cut of meat is marbled, but when slow-cooked, yields a moist, tender, and flavorful beef. A chuck roast is a shoulder cut of beef. Cuts from this section are generally a little tougher and should be braised or cooked in liquid for the best results. This is why it is a great cut of meat for a slow cooker pot roast.