PVP is too unbalance. I have all 3 classes, tank, dps and healer
Tank is well known to be a PvE class. No wonders he doesn't perform in PvP.
Healer is a support class by definition. No wonders he doesn't perform (as a killing machine) in PvP.
DPS are the killing machines, and Healer are to support them on making their jobs.

capture the flag
That will be fun and nice, +1 !

a scholar for instance is pretty impossible to kill even with three people
If that is right, it surely will be fixed some way.

Speed debuff just like all the monsters give you. Monsters do it, why not we?
Because PvP and PvE have two completely different mechanics. Mobs (usually) don't chase you to the full map and needs slow you to have a chance to get to you before you exit his designed area of influence. A PvP player will chase you until you are dead.