Damage is king. But, I think anyone that is using damage procs is probably also using LoTG, Panacea, Preventive Medicine, Miracle, Performance Shifter, Numina, Shield Wall, Gladiators Armor, Steadfast Protection, and Reactive Defenses. Oh, and the travel stealths and -KBS too. But I don't hear anyone arguing for those to be nerfed.
Gaussian and Force Feedback are also used a lot, and some have called for these to be nerfed.
The next group of Procs that get a lot of use are the KB-KD or just KD, Overwhelming Force, Sudden Acceleration, and Avalanche. I'd add Lockdown, Devastation, and Gravitational Anchors +hold to this group as a popular control. I have only heard complaints about KB-KD in certain powers . . .
All the stun procs are either low chance, low mag, or both and are considered horrible by most -- Energy Manipulator, Debilitative Action, Pounding Slugfest, and Executioner's Contract might be used more if they were buffed.
Finally, there's the ATOs -- some are just another damage proc but there are a few game changing ones (scrapper and stalker), many OK ones, and a few blah but I'll take it.
Here's an old proc list: https://hcwiki.cityofheroes.dev/wiki/Set_Enhancements_with_Special_Effects
And Macskull's very helpful and comprehensive spreadsheet: https://docs.google.com/spreadsheets/d/1vd4ZZd1jfhOzdZZkGxC9O0NN5G0T1EdWPu_XRrV6s0U/edit#gid=905771942