This is not a bad movie, it’s just not very good.
IT’S T–O–O L–O–N–G.
IT’S TOO DARK.
AND IT’S TO FOLLOW. DIFFICULT
At the start the same team of six from the first film is present: Thor, Iron Man, Hulk, Hawkeye, Black Widow, and Captain America. During the action Quicksilver and Ultron are killed. At the end the first four have checked out, and Black Widow and Captain America are left to build a new six-person team with Vision, War Machine, Scarlet Witch, and Falcon.
Maybe the third installment will be better.