I've only missed 1 year since 2004 (last year) and I've competed in 4 Masquerades. I've never really had a problem or heard any serious complaints by friends. Everywhere you go you're going to encounter 1 person who's rude and doesn't know what they're doing. Overall, Otakon is one of the more organized conventions I've been to and their Masquerade is better constructed than the others I've been in.
Fear the storm, it's coming.