You can't hold both films to the same standard, I agree to give you that. Avengers was set out to prove to have big named Superheros be able to have the chemistry to work together in one epic film, and it succeed. Whereas, Man of Steel was set up to reboot the Superman origin story to jumpstart the DC cinematic universe and that SUCCEEDED as well. So, what's the argument?
If you didn't like MoS due to your PERSONAL reasons, I can respect that. But best believe, people won't call out the hypocrisy to some of the arguments if you are a fan of another film based on the SAME GENRE which Avengers and Superman are. They are both comic book movie epics. Yes, Avengers is lighthearted and meant to be comic relief, but your complaints with MoS versus your dismissal for the same things in Avengers have NOTHING to do with TONE. And if it did, then it CAN be ignored or suspend belief that no human was killed in NYC during the so-called invasion and only damaged property was cause versus, the truth of two GODS fighting and human casualties end of being a huge collateral damage. You cannot have it both ways. If you are stating that they aren't the same standard, then accept the fact that human lives weren't at all lost and Avengers is a film where Disney would never allow to go there in that regard. OR, if they are the same STANDARD, then call out the bullshyt in BOTH films then and not just ignore it from one and not the other.