Everything BI has made for the game is amazing, in isolation.
The turrets on the vehicles look good in my opinion but obviously when compared to one another the weapons are identical. This seems to be a pattern throughout the game, with such objects as the FIA coats clipping with every single vest and many vest and hats clipping in someway.
BI certainly has the talent to make nice looking models and hopefully if they create a bit of diversity within the factions vehicles nothing goes wrong.
But yeah, it would be nice to have some shiny new turrets.