To be honest, you throw a way a hell of a lot of nice stuff for just 5% crit. 20 talent points for 5% crit is kind of silly, even if your crit isn't that high. There's gonna be glyphs for thundestorm so it does extra dmg but no knockbacks, so its gonna be raidfriendly (and it does _HUGE_ dmg i might add, tried it in hyjal on the trash)

The stuff before the 5% crit in resto tree are kind of useless. I'd never go with it