Blizzard doesn't release any half-assed games, and Blizzard fans don't do half-assed cosplay.
Of all the shows I attend and all the cosplay I see, no fans beat Blizzard fans for dedication, quality of work, and ingenuity. We're talking complicated walking apparatus, mechanic wings that open and close, plenty of glowy, flashy bits, and of course, the bravery to put it all on and prance around Anaheim all weekend long.
I salute you, BlizzCon cosplayers!