Late to the party--
Kleine Teufel and I started an all defender SG on Triumph in the fall of 2004, right after WoW subverted so many CoH players.
I have some random comments on the previous posts. Kinetic's buffs are well known, but it's a major debuffer, too. Did you know that siphon power and fulcrum shift can significantly reduce potential incoming damage? Did you know that Siphon Speed is an IRRESISTIBLE debuff after making the accuracy check?
Stacking a Dark and a Storm means you have stacked steamy mist and shadow fall, so the group in the overlapping buff zone is essentially invisible.
Skipping Traps from your mix of defenders is cuckoo for cocoa puffs. The -regen in traps is formidable. Traps represents well despite some players frustration with placing poison gas trap.
Stacking slows with freezing rain, keep the targets in place, tar patch, caltrops, lingering rad, snow storm (from storm or cold), neurotoxic breath - brings them to a screeching <near> halt. If you are playing positional and putting the foes where you want, a few well placed gales or shockwaves can move the bad guys back to the kill zones.
Don't forget that Forcefielders can protect from mezzes and endurance drain (remember the carnies, freakshow, malta?) A well-played Force Bubble is a rarity but can keep foes pinned in corners or against walls.
Folks, if you are unfamiliar with the debuff machine that is Dark Servant aka Fluffy, check out that Chill of the Night -tohit debuff. Fluffy doesn't use Tar Patch, but he does use Twilight Grasp
Additionally, -regen is particularly most useful at the start of boss fight. Howling Twilight, EM Pulse, the thermal debuffs, Nature affinity debuffs plus the usual lingering rad, twighlight grasp, Transfusion, envenom knock down the regen of tough targets FAST. HT and EM P don't need to recharge before the boss/AV is DEAD.
Liquefy isn't a stunning debuff, but it is very much underrated.
Trick Arrow is arguably a weak set to solo, but in groups the slows, -resistance, -regen, and the shiny Oil Slick complement the other defender's buffs and debuffs well. Disruption arrow is a solid debuff.
Poison is challenged to play solo, but it has some amazing single target debuffs. Suggestion: Poison users, lead off with neurotoxic breath for the chance to hold. The new kid in the defender stable, I don't know what the base numbers are on the tier 9 power PbAoE, Venomous Gas. Any new number crunchers have the base numbers for the -resistance, -defense -damage, -tohit?
I too, would enjoy joining an all Defender Superteam, with a defender from scratch or with some defenders I already have