Zeus, Bristle and Gyro immortals look like they barely even tried. With respect. Very half-hearted.
The Zeus one actually look pretty nice in game, Valve down played the new animations and only showed the single spell. They redid his attack animation, his attack projectile, and modified his Q's animation. Also has a load out animation, and he has a cooler portrait.
My only complaint is the sound effect for the new lightning feels off.
I like the Gyro immortal by its self, but it just doesn't go with the atheistic of the rest of the machine.