I think its just part of the game, yes it can get annoying but if I am playing a zones or CTF I will use whatever I can to get the zone/ctf. I don't try to make people mad or quit. I have been on the receiving end of A2g quite a bit and I don't care whatever weapon they use to do it. I personally hate getting killed by a homer while on the ground but it doesn't bother me to much. I see what your saying about the a2g weapons like Clusters and torpdedos. But the most common are flak and MG just because they are more readily available to use.
I just try to enjoy this game as much as possible. Also when I usually do kill people on the ground with my hawk I land so there is a better chance I get killed. But whatever it is I just try to have fun. lol
Depends on how it's done. If you A2G for an objective, like killing the flag carrier, defending a zone, or stopping a tank from coming into your base, then I don't mind. If you A2G for no reason except for a quick kill, then I think it's cheap.
That's just my opinion, though. I don't complain when people constantly A2G me... nor do I A2G back unless I have a reason.