I use them if I take my Galaxy R out simply becasue I have two tactical powers, and there's no room for an HYT on there, so it makes sense to take a torp that can't be HY'ed. My Excelsior's Quantum all the way though.
Being serious though, a Peng hit me today for 22k or so damage when I was trying to retreat :p
I dont feel with you.. Youve stalked me enough in Kerrat, waiting for my shields to be neut'd away, that all I can think is "Hah"
Regarding Pengs.. Havent had major problems with them.. 1st one is usually cleared by a HE, for the second, I usually pop my brace and/or that Devidian mission reward .. Or perhaps a PH.. Lotsa ways to buff up your resists ;p