1) Its same power as Power Shot (which isn't the most powerful shot anyway..lying name).
2) About Cannot be B&E is not a great kicker effect. If you are worrying about Blocks and Evades...Hey..theres a great elite that already has that (Crippling Shot) - It cripples and has a 1 second recharge with no crazy side effect like this.
3) Easily Interupted on a non-trap skill? 'Nuff said.
Yea...it doesn't have many practical uses. Though some use it in some situations.