I will summarize the previous threads on how to improve pvp. In order to make pvp better next mod (or in the near future), I only list those most people suggested to fix (the most important and feasible ones). Hopefully we should see these change soon.
1. Class balance rework
Fix the double infiltrator buff bug after TR bloodbath (20% more damage). With this nerf. TR will get 20% less damage from daily and sod. Also bllodbath double proc infiltrator's action, which may have 2x damage (2* 5%) buff if you use the offhand weapon feature.
Nerf base damage of GF a little bit. Most people agree GF is still overpowered so a little nerf on damage will make it more balanced. One way is to nerf the damage buff of passive power (combat superiority, etc.)
Fix SW infernal sphere bug. When it interact with certain power from other classes it will create insane loop and hit 100+ times in 2 seconds and lag the whole instance. E.g. when GF use that daily which reflect damage back to enemy, or when OP use tab.
Fix OP shield strike. Most OP at least in PC spam shield strike without hitting enemy to gain 3 stacks of shield which makes them almost immortal. Even the best TR can’t bite them a little bit after they build 3 stacks. One way to fix it is to make shield strike work only when hit physical enemy.
2. Remove broken items. Any item that takes 1/3 of enemy’s hp away in 1 second or stun people suddenly (unpredictable) will make the game less consistent. Fix or totally remove mane of manticore, cowl of dead, sandy’s pants, as suggest by almost all players. Cowl of dead is especially broken on TR since they can stealth and proc bloodbath suddenly to prone you. With the high damage build their bloodbath can kill you in less than 3 seconds which is not fun.
3. Rework on cc stacks
Some class can control you for more than 10 seconds in a row with 5-6 control powers and yet make you gain only 2 or 3 cc stacks.
This applies especially to trapper. Trapper can keep controlling you till death if you are a CW or SW. One way to fix is to count cc stack as the number of control power used.
4. Place a soft cap on certain stats.
Most people and devs believe [Recovery] from TR need a rework. With 20k+ recovery most TR can hide in stealth and keep annoying enemy. [Life steal] also need a rework, some gwf and and sw can heal themselves from 20% to 100% in less than 3 seconds. Any class that builds extreme dps and life steal can be unbalanced without a cap. [Deflect] may also need a soft cap. With the 25% deflect chance from eclipse enchantment it’s so easy for some class to stack 100% deflect chance and make them almost unkillable. This is especially important considering the 75%-85% deflect severity of TR. Many TR in PC has reached 100% deflect chance.
5. Remove stamina and AP drains. Since almost all people agree these 2 stuff are overpowered so removing them will make pvp more attractive. Most people don’t carry a ward since they wouldn’t expect people to use it. But there are still some people exploiting it. These drains are especially overpowered on TR, HR and SW. given how fast TR and HR can proc daily (TR bloodbath, HR interruption shot), they can drain people’s AP too fast. For SW, one daily can drain people’s AP from 100% to 0% in 2 seconds. Although this may not be a bug but it’s much overpowered. Since only a small proportion of people are abusing them so removing them will make most people happy without affecting a lot of players.
There are much more things that need to be done in pvp - map, rewards, queue system. But given how complicated it is to fix these stuff in neverwinter, I would suggest only fix these important but simple stuff first before reworking on more complicated issues. This will at least satisfy most people who complains pvp a lot and hopefully attract more players into pvp.