No they don't, but they automatically hit a random flying unit each turn (that's not written, unfortunately was the design doc but like always happens I have added a lot of tweaks to the cards while codingFranka wrote: Does Missile Turret even make sense? Why would flying units attack it when they don't have to attack walls?
). But yes is not worth to set legendary cards for the turrets, except maybe those who do double damage. I need to check with some test missions 
From the changelog text:
I also moved them to the legendary tier obviously, since having 3 of those you could win any battle easilyMine, Residential and Solar Farm are Tier5 (epic)! This because of new features added. They still give the resource increase like before, but in addition they give a big bonus on summon: Solar Farm grants force shield to adjacent units, Residential summons 1 random Tier1 infantry unit whenever you summon an organic one, Mine summons 2 random Tier2 turrets (cannon, flame, laser). Some are more powerful in certain situations, I preferred to make them varied
