Air/Galactica my personal opinion is that its a great idea with, and I hate to say it, an awful track layout. It's meant to give the feeling of flight, but you spend half the track on your back like an upside down turtle or ladybird.
I'd like to see something like Chessington's Vampire combined with the Air harnesses, so you get the free swinging around the corners to give a proper feeling of flight with nice sweeping corners and drops.
I had a soft spot for Air. It was my first ever "upside down-y coaster". However I completely see what you mean about its layout. Doesn't make for a bad experience for me, but it certainly isn't "flying"!
Really like the idea of a swinging flying coaster though! I'd love for one of the big flying coaster manufacturers (likely either B&M or Vekoma) to look into something like that in the future!