Buffy herself always sees her power as something positive
Except for the parts where she tries to give up her responsibility as the Slayer or dies twice because it's her job to save the world? And where she criticizes the three men in "Get It Done" for "violating that girl" and giving her the demon which makes her the First Slayer? It's not context-free power.

I love the show and see its problems at the same time, personally. They're not mutually exclusive modes of watching/enjoyment.