The only(?) downside about dex fighters is that currently dual-wielding doesn't work properly. Last I heard, the game doesn't add your dex modifier to attack rolls with off-hand weapons.
Shouldn't that be a privilege only for people who took the appropriate feat?
Not that it would save DW from sucking anyway, but still.
You should always get your dex bonus to attack rolls, both main and off-hand.
The two-weapon fighting style allows you to add your dex bonus to
damage with off-hand weapons. I believe this fighting style is working correctly atm..?
The Dual Wielder feat allows you to dual wield non-light weapons and gets you a bonus to AC.