Is a built-in coffee grinder good or bad?

Apparently, it's not a question of good or bad, but rather one of preference.

As you might know, there are two types of coffee grinders: blade and burr. The blade grinder is popular because it’s cheap and simple to use; all you have to do is pour your beans in the top and twist! In contrast, the burr grinder is more expensive but offers a smoother consistency; it also has the added benefit of different settings that allow you to produce various amounts of ground coffee.