Flaws in Avengers: Infinity War?

Blu commentary points out Cap's original planned entrance wasn't until Wakanda, right before Thanos.  Rogers was staying off the grid for both his sake & that of the Avengers post-Civil War.

His role will undoubtedly be huge in End Game, esp if they were originally withholding his participation for 95% of IW.

To many characters and to little time.

terrible cgi for a 400m film

I actually agree with most of those criticisms. But again, at the end of the day, they’re minor nitpicks.

I think there's a difference between stuff that we didn't like or would have liked to see more of... and stuff that were legitimately weak, inconsistent, incorrect or just plain stupid. Examples of the latter are:

1. The inconsistency of the power levels of the Black Order - in particular Proxima Midnight and Corvus Glaive. In one scene we have Corvus Glaive trading hits with Vision. In another he's put on his ass by a kick from BW. Proxima is tough enough to get thrown around by Wanda through burning vehicles yet is also knocked off her ass by a kick from Falcon. Cull Obsidian was strong enough to overpower Ironman, even Hulkbuster, but had his weapon stopped dead in its tracks by Spiderman.

2. The ease with which the Asgardians were defeated in the beginning. We know from Agents of SHIELD that even a lowly Asgardian farmer is strong enough to throw around cars and crumple tactical knives in his grip. So even if majority of the Asgardians in the escape ship were civilians, they still should have put up a good fight. That's not even including elite Asgardians like Heimdall, Loki and Valkryie, plus Hulk and Thor. Instead in the beginning it looks like Thanos' team didn't suffer any damage and easily annihilated the Asgardians. Considering what we know of Thanos' forces plus the strength level of his children, we should have at least seen multiple carcasses of outriders and his Black Order should have at least have had battle wounds.

3. The mistreatment of Bucky - This is a guy who's supposed to be near equal to Captain America, yet in the battle of Wakanda how come only Cap and T'Challa are seen outpacing all the others in their run? Shouldn't Bucky be able to run just as fast as they do? Furthermore, why didn't he get some advanced Wakandan blaster as a weapon instead of a regular rifle?

4. Thor's powerset - this movie makes it seem that Thor needs a weapon to use his powers, when we know after Ragnarok that he should have been able to use his powers on his own. In fact, his lightning powers seemed to be even more powerful in Ragnarok than here. It would have been nice to know what exactly Stormbreaker grants him other than it being able to cut through Thanos. My theory is that it should have allowed him to use the odinforce... but that's never discussed. And so we almost completely lost the growth we got out of Thor from Ragnarok when he stopped being depending on his hammer.... to now being dependent on an axe.

5. Gamora's personality - this is supposed to be the most dangerous assassin in the universe... we see none of that. She's portrayed as the one with the softest heart among the GoTG, and seems kinda weak personality wise. I just wish they portrayed her as more badass to keep it consistent with her backstory of being Thanos' favored daughter. Nothing about her showcases her being "strong" as Thanos often mentions.

6. Starlord hitting Thanos in the face - I understand that Starlord is a jerk. I understand that he was grieving for Gamora. But regardless, Starlord is still not a complete idiot and only a complete idiot would have acted like he did. That scene should have been handled way better. 

Congratulations, you surprised everyone.

How can someone be turned into a spring and still be alive afterwards?