I've got it on Tufty on even with defender dmg I wouldn't swap it. Any nuke is suituational really and some people like them, some don't. I guess it depends what sort of corrupter you are playing, i.e. either more defensive (defender) or more offensive (blaster). You have to remember you have access to tar patch aswell which reduces resistance so you can get a bit more dmg out of it aswell using that. Theres also the -acc effect that blackstar applies so if anything is left standing they have a smaller chance of hitting you. If you want to look at what sort of dmg the defender version can do then let me know and I'll be happy to show you 
Well, it's not great, but damn, it's cool to run into a mob and explode in a huge blast of darkness. And then you team with a /kin and suddenly it *is* great. More than great.....
Thanks to you both for the replies - looks like Blaskstar's on the shopping list then.
I've never ever seen blackstar 
IN MEMORIUM OF GAYBABY
CRUELY TAKEN FROM THIS WORLD WHILE SO YOUNG
My D2C's slowly inching towards 32 and access to his top primary power, Blackstar.
My question for those that have been there before me is simply: is it worth taking?
I'm used to Nova from my main, and BU + Aim + Nova does do a fair amount of damage but even then leaves bosses and some leuts standing on typically hard missions.
So does Blackstar, sans BU, sans Aim, and with Corruptor damage < Blaster damage in general, really cut it?