Quick observation about class numbers.
Maybe they got destroyed/owned by a pro in W3 or spvp and decided to make one themselves?
Lyssia Iceblood of Gandara – I sometimes win… but not often :-(
From my experiences though usually your easier classes are played more and the ones that require more skill are played less.
More importantly, I’d say, is that they’re the flashiest and most intriguing classes, and also the classic mage types. Flashy mage types are always high on the list of appeal, and looking cool trumps play difficulty.
Because even if the player has no skill, a person with a mesmer has a very high chance to beat someone on a warrior just due to class design.