They were annoying, but strangely I miss them
But the AI must be changed- in TES3 air creatures had no idea how to fly vertically other than by 90 degrees
Even better cliffracer AI can made in manner that resembles how they were flying in TES3
Explanation can be that they fly over their prey and then charge down using additional force of gravity to inflict more damage
P.S. And I really don't buy that "cliffracers drove out the dragons" bs, unless native Nirn dragons are weaklings
Maybe dragons of TES5 will be tougher
BTW are invading dragons aedric or daedric in nature?