2 - The existence of insanely powerful weapons, which can obliterate entire battlefields-worth of enemies in a split second.
Eh? Seems an odd complaint. You'd sort of expect obscenely powerful superweapons in that sort of setting, especially given that the shows tend to have an anti-war bent and are made in Japan. Is it more the way they're handled that bugs you?
Maybe I wasn't specific enough. While I was writing that, I was thinking in particular of the Gundams, which are head and shoulders above the competition in the later Gundams. Think Kira, firing all of Freedom's weapons at once, and destroying seven to ten enemies, all with non-lethal shots to the pilots.
Beyond that, I hate how mobile suits are the end of warfare in the Gundam series. I realize that the entire show is an elaborate way to sell toys to children, and I fucking LOVE mecha, but the way they're handled doesn't make much sense to me. With very few exceptions, nobody who is not in a mobile suit, can take out a mobile suit. I would imagine that if Mobile Suits were to become the reality, tactics and weapons would evolve to combat them. I mean, the invention of the tank changed the warfare of the day, and though they are still insanely effective, the way we
do war has evolved to accommodate the tank in such a way that there are times and places where they can be destroyed with ease.
(Now ... this might not ring true today in an America-dominated world. The state-of-the-art nature of the M1 Abrams, and the fact that they're currently fighting insurgents in the third world mean that my example might not ring true. But the ZAFT-Earth Federation gap was never implied to be as large as the USA-Afghani one. In a multi-superpower world, no one weapon platform would so outstrip the other without appropriate countermeasures being developed)
As far as superweapons/weapons of mass destruction are concerned, there are some Gundam WMDs that I have no problem with, or even like. The Cyclops system that the Earth Federation set off in Alaska was okay. Even the pseudo-death star thing that ZAFT developed was fine. But none of the Gundams, I thought, were acceptable.