It's downplayed in some Galactic Assault maps that do feature them, as the mode hardly focuses on aerial gameplay. Despite being level 0 starfighters (meaning they have no Star Cards to enhance them), the bots are fairly competent at tracking enemies and evading accordingly just like any beginner-to-average player sometimes, they can even get the jump on you while you are damaged.
It's not necessary to actually dive into the Star Destroyer's hallways, but with the heavy amount of turret defenses and starfighter interference, it's by far your safest bet.