Klaus said:
"My target is 40 ft. away and 100 ft. up, what's my distance to it?"
Claudio, I need to introduce you to my good friend Pythagoras.
My problems with flight are:
1. Dragons are too F'ing fast. Seriously, something bigger than an albatross shouldn't be able to fly at 60 miles an hour. Their speed makes combat against them irritating. Thankfully 4e won't have iterative attacks (probably), so it won't suck as much if you want to ready an action to attack when the critter comes close.
2. A more maneuverable flying critter should gain a benefit against a clumsier one. Maybe just make it Dexterity-based, but somehow, I want my archer riding a giant eagle to be able to better avoid the attacks of a huge, slow dragon. This is also a problem with D&D's lack of a chase mechanic in general.
As an aside, once we had an encounter with a goblin on a worg, and me on my horse. The goblin fled and shot at me, but my horse was faster, so I chased after it and reached it (shooting an arrow as I went). Then on the goblin's turn it ran away again, and I had to chase after it again. It was a really odd initiative sort of thing to have him go a long distance, then have me be far enough away that I could get fireballed and he wouldn't be hurt, and then to have me get up to him again.
If nothing else, there should be
some concept of momentum in the game. If you're double-moving in one direction, the next round you should not be able to move backward or sideways without some sort of Dex check or something.
I am amused how, in flying, there is no facing, so you can be flying east, but if someone comes at you from the west you can turn around and bite him, apparently flying backwards as you fight.