The hate (1*) and the glaze (5*) is out of control in these reviews. It's a Marvel (Disney) movie. Not great, but not wholly terrible.
Lazy writing like usual, but, if you turn your brain off and don't ask too many questions, you'll have a good enough time.
*EDIT*
So, I gave it another watch and the most I can give it is a four. Sfx were great. Chemistry and dialogue between characters is always fun. The consistent problem with Marvel movies has always been the story. All the five stars you see in these reviews are exactly why your local taco bell has 4.7* on Door Dash. It's not a 5* masterpiece, it's a high 3 low 4 at best.
That said, Marvel fan or not, you will have a good time watching this movie.
*Second Edit*
I couldn't in good faith keep it at a 4. Ironman is a solid 4, this isn't as good as that.