Pretty much yeah, especially if you throw in debuffs as well. Personally, I'd go for something like:
2 /Kins, 1 /Sonic, 1 /thermal, 1 /Cold, 1 /dark and 2 /rad, with varying primaries.
Hmm sounds quite nice could have quite a devastating squad there, now if only I voulf start one up for pvp or get in one 
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Sounds crazy but I was wondering if you had a bunch of corrupters who all buffed each other with lots of shields, could you in effect get a tank mage squad?
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Yes. 2 sonics and 2 colds perma buffing and you are nearly unkillable. Throw in 4 rads for healing and dmg boost.
Apply shields and AM every 2 mins, and you are basicly unkillable while you are doing a [censored] load of damage.
Kins are awesome, but the first really good power comes at lvl20 (speed boost), and the real treat comes at lvl 38 (fulcrum shift). These are great, and if you dont mind being less effective till lvl 38, change 2 rads for kins.
There isnt really any need to take leadership pool all though this adds greatly if all players have it.
For PvP 3 therm rads, 2 cold, 1 kin, 1 sonic, 1 traps.
Therm rads for buffing/healing. Colds for some kick [censored] debuffing, kin for sb, sonic for clarity, traps for -jump/-fly.
A Paragon Defender
I really wouldn't describe a pre-38 /kin as less effective. Unless you mean less effective then a post-38 one, but certainly not less effective then any other corruptor in the game.
The only start to come into their own from 20+. That's quite a long wait really.
IN MEMORIUM OF GAYBABY
CRUELY TAKEN FROM THIS WORLD WHILE SO YOUNG
Along with the patron shields and possibly the toggles from the fighting pool? DOOM!
Yeah, a kinetic corr is one of the best AT to group with from lvl 20. Speed bost is one of the best buff along with AM.
Although, i agree an all corruptor team is great fun, it can't be as effective as a team with different AT. You want a brute at least, preferably one with a taunt/damage aura.
Have you ever witnessed a couple fire/fire brute backed up with fulcrum shift? Scary! I just love herding i guess.. Just so fun to see 20 mobs dying a in a few secs from Aura 
Wonder how it would do in pvp, that could be interesting although a doms might be needed then.
Tried it in mass PvP, with a couple of stalkers as the damage dealers. We OMGWTFPWND the heroes
IN MEMORIUM OF GAYBABY
CRUELY TAKEN FROM THIS WORLD WHILE SO YOUNG
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Although, i agree an all corruptor team is great fun, it can't be as effective as a team with different AT. You want a brute at least, preferably one with a taunt/damage aura.
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I disagree. Never tried it with corruptors but I'm in a weekly all defender teamup, 8 defs, all different primaries. Now we are in our mid 20s we can rip threw TFs without breaking a sweat (and that is on invinsible).
Hmm I wonder how many stalkers might be needed then to help the corrupters that would be quite fun, AS+scourge ooh 
only 1 or 2 are needed, with more then you start to suffer cos you have less buffers and debuffers. The great thing is that stalkers with lots of buffs on tank pretty well as the damage they do allows them to grab the aggro.
IN MEMORIUM OF GAYBABY
CRUELY TAKEN FROM THIS WORLD WHILE SO YOUNG
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The [/kins] only start to come into their own from 20+. That's quite a long wait really.
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Hmm...Transfusion is the most powerful (numberwise) area heal on the villainside (lvl 1 power), and especially for melee builds it's probably the 2nd best effectively (nothing beats Cauterize). On top of that, you get siphon speed (lvl 8/10, I forgot), which is an AWESOME power! It means you dont need to get a travelpower, saving you 2 powerslots as soon as lvl 14. On top of that it makes your attack chain so much smoother. I don't know about you, but I loved my /kin from lvl 1.
Transfusion, siphon power, repel and siphon speed don't come close to RI, AM, EF and RA, for example.
Look, no one is saying /kin is bad before 20. I believe the point of the above posters was, other corrs bring more at low levels. Especially in a all-corruptor team, where heals are meaningless and team buffs/debuffs shine.
Sounds crazy but I was wondering if you had a bunch of corrupters who all buffed each other with lots of shields, could you in effect get a tank mage squad?