This game is not focused on PvP (at least for now) so the balance they do is gona be around PvE and not PvP, also Energy Blast does need a nerf, is a low cost hig reward skill that does hig AoE dmg with knockback, imo they need to change it a little maybe remove the knocback increase the cost (10%-15% sp per lvl chargued) increase the cd, dmg is kinda fine.
Back on topic, i do think they do a lot of dmg (12k at lvl 200 when cap is around 500) but i also belive the main problems is the AI of mobs, they dont fight back, they just stay there looking at you and maybe attack once while the swordis jump and 1 shoot them.
If anything improve the mobs AI, hp, dmg, defence instead of asking for class nerfs, would make the game a lot more fun when theres real challange and not just goign around 1 shooting packs of mobs with auto atacks.