Whole film is not worth to watch because of first half

Rating: 6/10 (5 May 2019)

I really do understand why it should have some emotional sides in this movie but I really don't understand why did they decide to put too much. It was way too much and made it boring especially in the first half of the movie.
Ruined the last movie logic in some ways. First of all, in the last Avengers movie, at the last scene, Captain Marvel was called. Why did they put this scene in the last movie if they decided to give her the least role? It made no sense. The tension in the last movie was balanced but in Endgame there was no balance. One scene doesn't fit second one as it started losing it's consistency.
Alright, it's not the worst Avengers movie but way worse than the last one. Is there any explanation of all those scientific stuff they made up? If you want to make a good movie of superheroes, I guess you should not use pseudoscience or very weak scientific arguements. They shouldn't mention those scientific arguements in the movie. It would be better without those weird explanations. If there were cuts around 1.5 hours of movie, it would easily get over 7 points from me but I felt like this movie took my time without any sense.
Cheap tricks... I wonder why they used time travel idea in this movie and why did they say Black Widow had faced permanent death while Gamora had return from another time. Why did infinity stones didn't remain after Thanos used them to kill half of the livings but after Hulk revived all the dead people and Iron Man used them to kill all the enemies. This was very unclear.