Evasion's more broken than confuse ray and thunder wave though, because--
Because you go up against confusion and paralysis without having prepared yourself specifically against them and still do just fine. If, on the other hand, you go up against evasion without having prepared yourself specifically against it, you stand very little chance. It turns the whole metagame into a rock-paper-scissors match between normal teams, evasion teams, and anti-evasion teams.
"Amaura's been in my line up pretty much the entire game. Guess I'll start cramming protein down his throat for the next three hours." - barneyonfire