Despite often being called “pellet grills,” they still cook via indirect heat, as opposed to flame, and are better seen as a smoker. They’re excellent for smoking briskets, chicken and turkey, salmon and other fish, but maybe not for steaks, as you won’t be able to get the same crispy, browned sear they call for, and that you can get with an open-flame grill.
Although these are marketed as grills, they do much more, including baking or roasting. Because they heat by convection, you might not get the grill marks that a gas or charcoal grill will give you, but you also won’t have the flame-up problems. While many pellet grills offer high cooking temperatures, the maximum depends on ambient temperature and wind. Many users wrap their grills in special insulating covers to help maintain heat, reduce fuel use, and reach the higher temperatures they desire.