Yea, given the power set of some of these characters, it becomes prohibitively expensive to showcase it fully (and even then, there are limitations - for instance, having a full on battle between Superman and an enemy of his level will result in casualties like in MoS. It's not as big of a deal in comics or animated stuff; part of Metropolis was also destroyed in JLTAS's first episode).
MCU's solution was just down-leveling everyone, but that is also a bit boring, especially when we know how powerful some of these characters actually are (in comics).
AM wasn't too bad - though he did end up hurting a lot of folks when he showed up with the monster. Granted, he was fighting military and trying to stop a full on war...but one side was just defending themselves from Atlantis and its allies, but the monster AM showed up with, wasn't distinguishing between Atlantis/Xebel and other kingdoms.