Yup apart of SoB and Space Wolves every other army has Flyers / FMCs. And yes the problem isn't flyers, it flyer spam. If you can't deal with 1 or 2 Flyers then I am sorry you are just bad at the game. If you think they ruin the game, then go play 5th ed and stay away from the rest of us who don't mind.But don't all armies have a flyer or FMC now? As weren't all the marines dexes given the stormraven/talon? Apart from SoB of course but they aren't quite marines. Granted some of those are crap like the DA ones, I personally don't see a problem with them as its not like the sole purpose of an aegis line is for AA, granted that might be the reason you bought it, but it certainly provides a good fortified position behind which you can stick a relatively weak troops an go to ground with another unit on the gun. The only problems I can see with flyers is flyer spam ( which you only really get at tournies and is rare in friendlies unless it is at a FLGS and the player is a douche) and the Helldrake which everyone complains about anyway. Also Can someone also clarify tau AA for me, as it seems pretty good when they can give it to suits and marker lights effect snap shots etc.
As for Tau AA, it is ridiculous, Boardsides with the Skyfire System (forget it's name atm) and Missiles will swat flyers out of the air all day like it is nothing. Even without the system, marker lights improving sap shots still make it much easier for Tau do deal with Flyers then any other army.