480p is also known as 720 x 480 pixels, it has the capability to display 345600 pixels on your screen. It is commonly used for burning DVDs and perfectly goes for the small and medium screen like smartphone, tablet, desktop and laptops.
You can even watch TV in this resolution but only a few channels where the movement of the screen will be less in comparison to the movies and others.
So if you want to know is 480p good enough, the answer is yes. It works satisfactorily in mobiles and a lot of other small-screen devices.