Honestly, I don't think that poor storytelling should be accepted or pardoned just because the source material comes from a different medium.
Solid storytelling doesn't need this kind of justification. Calling it an uncanny fanservice and then redirecting people to the comic book (which I have read) isn't a good thing. Most people won't buy the comic book, most people don't really care about the comic book.
A lot of the big cosmic entities are blatantly absent from the film. Where's Infinity, Love & Hate, Lord Order & Master Chaos. What Thanos did in the comic has nothing to do with the comic, nor history wise, neither symbolic wise. So basically you end up with a FILM where your could pretty much have thrown any unknown characters with the same abilities/powers and obtain the same result.
MCU isn't doing any justice to the comics. It's a completely different history, with a different take (much tamer than the one in the comics - remember what triggered the Civil War on the comics? civilians, kids getting killed by unchecked heroes actions, not a petty squabble with the UN), and honestly it looks like just a shameless cashgrab based on existing and loved IPs