Dormammu is a casually genocidal and absolutely sadistic, arrogant, greedy, and power-hungry megalomaniacal narcissist and tyrannical mass-murderer with a god-complex, yes (his personality is probably the most similar to that of Donald Trump of all Marvel Comics villains, except for that Trump is also braindead, whereas Dormammu is quite clever when he manages to restrain his arrogance), and, for example, he once transformed the entire 616 reality into a literal fascist hellhole.
Obviously I am not saying that Wanda and Dormammu are remotely similar. I am just saying that Wanda reads like a shallow arrogant and quite unsympathetic power-trip without an interesting personality or storyline, and that's it. I basically don't see any worthwhile point to her existence as a character.