Biggest complaint - Hulk transformation (or lack thereof).

Bruce Banner's direct quote from first Avengers movie: "I didn't see an end, so I put a bullet in my mouth and the other guy spit it out." This is exactly the kind of crucial detail that was shared to ALL of the original Avengers including Tony Stark. Especially since Bruce already knows this and used it effectively to change to Hulk in Thor: Ragnarok. In Avengers: Age of Ultron Black Widow pushes Bruce down the chasm to bring out the Hulk AS WELL!!!

I'm genuinely pissed off at this development because ALL they had to do was stab or shoot Bruce to make Hulk come out. Hulk has no choice when Bruce is in mortal danger FYI. So why oh why were they protecting him from Black Dwarf like he was a pleb civilian??? Makes no goddamn sense.

In fact, I was expecting him to hurt Bruce mortally only for Hulk to take over and beat the **** out of Black dwarf and Ebony Maw with his right hand behind his back.