From looking at the code, Power Wave is a weapon hit, so it doesn't use your catalyst accuracy and catalyst crit chance. However it does use your weapon's bonus accuracy and crit chance regardless of whether it's a catalyst or not.
What the power having both [Weapon] and [Spell] tag does, however, is that it will use either your armor penetration or your spell penetration, whichever is higher. On the other hand, it also means that the power should be disabled by both Disarm and Silence.