I hate incongruous events. Yes, to be clear, I'm going to talk about events that took place in a fictional world with an extremely tenuous connection to any surmisable reality. I do not find that problematic. Again, if you do, there is most likely a really nice web ad just to the right of here that is begging to be clicked on.
As background, in the Marvel universe there is a war happening on Earth. We're being attacked by Skrulls - shape changing aliens that have found a way to mimic superheroes and their powers. So it's like Earth fighting all of our superheroes.
That's cool. Great story. Until...
they involved Asgard. Now, it's one thing for Thor to be fallible. Thor (as a Marvel universe entity) is not omnipotent. Hell, even as a Norse god he wasn't omnipotent. But the entirety of Asgard, by all accounts, should be able to lay waste to anything not from a peer pantheon. No questions. So Zeus versus Odin - ooh, horrible war there. Odin versus the Celestials, nothing good can come of that. But some random race of aliens should not even cause Asgard to stop making breakfast.
And I won't even get started on some single alien whipping up on Beta Ray Bill and then Thor showing up and thinking that he was going to save the day. Beta Ray Bill beat the snot out of Thor. That being the whole reason he has a hammer too.
Anyway, this was my rant using this particular comic to illustrate that authors should remember that fans have very long memories even for things they aren't that interested in (I've never been a huge Thor fan). And our logic glands are fully functional. Consistency in the universe is very important - particularly when your audience is comprised of non-stupid people (this set usually demonstrates a great union with the set commonly referred to as "geeks"). Movies violate this a lot. I sometimes forgive them. It is less forgiving in limitless mediums such as writing. You can write whatever you want. No budget. No special effects team saying, "oh, but that'll cost ya." So it shouldn't be so hard to keep to a particular set of rules you've drawn up for yourself - like deciding to use gods as characters.
I mean, gods...
Or should I coin the phrase, "Oh, my fucking skrull!!!"
(you guys are so wishing you'd clicked on the web ad...)