Generally Corruptor buffs/debuffs are 75% of the effectiveness as defenders. Defender blasts are 75% of the damage of Corruptor blasts and they don't get scourge.
@Unthing ... Mostly on Union.
Slight correction : defender's blasts are around 87% of corruptors blasts.
IIRC : cors are at 0,75 damage, 0,75 buffs/debuffs
defs 0,65 damage, 1 buffs/debuffs
The debuffs sort of make up for the difference in damage, though. A rad/sonic defender does a fair bit more damage than a sonic/rad corruptor. Of course, this is leaving inherent powers out of the question since the defender inherent is so laughably bad it's not worth even thinking about.
Not all defs use debuffs, in the case of kinetics cors can have way better dmg (higher base + FS capping you + 500% dmg cap instead of 400).
/cold also has -30% res in both -res powers, and /dark's tar patch is -30% (same as defenders).
The problem is mostly in pvp, with the -40% unresistable res debuffs instead of -30% in pve, and the abundance of powerbuilds. Most cors outdamage most defs in pve.
In a very general sense from someone who plays predominantly heroes and doesn't have a corruptor over level 40. I find corruptors mcuh more versatile at lower level just simply because the inherrant is so much better. I get the feeling things really even out once you take the epics into account.
I see the patron pools being useful too. I get a pet as a sonic/sonic corrupter and suddenly i do more damage and have someone to anchor debuffs to when solo.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
It´s hard to tack a fixed value to the percentage of buff effectiveness comparing defender primaries and corruptor secondaries. (The 0,75 percent value applies mostly to the attacks´ secondary effects.)
This comparison of defender primaries and controller secondaries shows how complicated the whole thing really is. From my own experience I can say that kinetics really is corruptor-friendly. Kinetic corruptors... monsters! 
If it has eyes, you can blind it, if it has blood, you can make it bleed, if it has a mouth, you can make it scream.
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Kinetic corruptors... monsters!
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QFT 
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
Out of interest whats the damage buff like from siphon power? Could it be used as a build up replacement?
My MA IDs:
Fiend Space: 211464
For Defenders its 25% of base value but it does stack with itself.
Octavian Vanguard
@ohmsEU and @ohms 2
Badging character: Bimble on the Union server, Badgehunter.com and City Info Tracker.
IIRC the buff was something like 20% for corruptors... and stackable. IMO this is a quite nice build up replacement.
If it has eyes, you can blind it, if it has blood, you can make it bleed, if it has a mouth, you can make it scream.
So realisically 40% to 60% depending on circumstances. Isnt build up something like 100%? Still, this is a lot better than nothing, and then theres fulcrum shift later.
My MA IDs:
Fiend Space: 211464
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Isnt build up something like 100%?
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And active much less frequently, perma-Build Up was squashed in the US beta.
Just wondering...
some defenders sets are usable by corruptors too, so i was wondering..what's the % difference?
lets take dark miasma and dark blast as examples.
I suppose defenders twilight grasp heals more point than corruptors one.. and i suppose darkest night debuff more DMG and ACC..
but is there many difference?
and what about blasts? :P