I wanted to first start this off by stating these are PVP suggestions only they should not affect PVE. Now with that out of the way, I don't think its any secret in PVP that melee and control ATs a way out performed by ranged dmg. I wanted to throw out a few suggestions to make melee and mez worth playing again instead of PVP being all out blaster warfare. I would suggest travel suppression again but since I know everyone hated it I will leave it off the table.
For melee I would suggest increasing the speed cap for all Melee based ATs, you would have to slot for speed so it wouldn't be an all out "give me" but it would give melee ATs some kind of chance at catching someone blasting them non stop at range, this still doesn't address the fact that there is no reason to take any melee powers on ranged ATs even though they have access to them. Another idea would be to add a
-range effect to melee attacks for maybe 3 seconds that way when you land a melee attack someone would have to get back into melee range to blast you again. The last idea I have is bring pack toggle drops for melee attacks, this was super frustrating on live but all blasters still took their melee attacks like bone smasher for energy. Toggle dropping could be limited to just travel powers just to bring the flight to the ground for a bit.
Mez is the more difficult problem to fix right now as it is directly connected to the over abundance of damage non mez based ATs have. An 8 second hold isn't very overpowered for a solo controller but when you add anyone else to the equation they are dead in the water. Aside from nerfing damage which I am positive no one wants, the only suggestion I have (which I am not sure if it is even doable) would be to have and
-damage effect on mezzed players while increasing mez duration. This would essentially help control AT's help take someone out of the fight by holding them but not leaving them an automatic kill when held. There are probably some better ideas out there for mez fixes but I don't think the current system is working as patron and epic holds are worth more salt than any hold from a controllers primary.