She has a very interesting history, in my opinion, and the writers made her seem real by giving her a real weakness, claustrophobia. She has one of the coolest powers and she’s over all a very strong character. When she was depowered, she still beat Cyclops in a fight, even though he had his powers.
Magneto is a Holocaust survivor, so his fear of oppression is understandable. His dream of mutant supremacy is his way of protecting his people. It’s a dog-eat-dog world out there and he knows it. That’s why I like him; he doesn’t want the world for shits and giggles, he wants it as a haven for his kind.