Just doing the math and testing it in combat, 2 handed weapons are inferior to both 1 handed and dual wield options. The overall DPS for 2 handed weapons is MUCH lower. I have yet to find a scenario where using a 2 handed weapon would be more advantageous overall.
Either 1 hand/dual wield styles need to have their respective recovery times doubled or the recovery time for 2 handed weapons needs to be halved or the dmg of each individual 2 handed weapon needs to be raised by 50%. Yes, that's right... as of now, there is that much disparity in their overall dmg output.
lowering the recovery time for 2 handed weapons by 50% would probably be the best option because of the faster combat in POE2. Watching a character just stand there motionless for extended periods while all other characters and enemies around them are moving in frantic combat appears odd and out of place.