Back when the X-Men were born into the Marvel Universe, flying must have seemed pretty handy. Then came a flood of mutants who could do the same thing while doing other, more important things — like controlling the weather, for instance.
Marvel's tried to spice up Angel over the years. They turned him blue and gave him bladed wings, but they molted. Didn't he have power over life and death at one point? Lately he's developed the secondary mutation of being a grinning idiot, which seems nice.