Actually melees are OP all game long. Playing 2 lone wolf 2handers now. The only thing that changes in my strategy from early to end game was my movement speed. Now I can run to the furthest enemy and kill him then go back in one turn.
For the beginning when I wasn't in god mode yet I just kept running to a corner to force the AI to chase me there one by one. Well, you know the rest lol.
End game consists of go invisible to the middle to a large group cast oath to start the fight then whirlwind and dust evil. Fights almost always ended in 2 rounds. The only exception was when I wanted to farm the boss. Then I have to gradually kill off everything first and the boss last. But ye if I want to nuke everything in this game in 1-2 rounds I can.
Only lvl 17 now. But I am better geared and kinda stronger than the lvl 22 melee-mage pair I made in the first play through. Glorious!