Just look at Sins of Sinister. Mutants get influenced by Sinister, lose their morals, give into their worst impulses and you have mutantkind defeating other super human beings, overthrowing the government and effectively taking over the planet without hardly any opposition. Then they've gone on to conquer the wider galaxy, so how can anyone claim mutants are underdogs given what we've seen. And if the argument is well only a handful of mutants are powerful and the majority are not, well only a handful was able to conquer the galaxy. Unless of course X-fans are willing to say the MU was jobbed hard for mutants to achieve what they did. I think we're long past the point of seeing mutants as underdogs, that ship as sailed. SOS as proven that if mutants break bad they conquer all.