I watched this today. I honestly can't help but feel that a lot of the people hating this film either haven't watched an Indiana Jones film (besides the 4th) in years and forget what they were like, were irrevocably determined to hate it because of the outrage machine, or just never watched it and formed an opinion anyway.
It feels every bit like an Indiana Jones film, in a way that the 4th never captured (and trampled all over in its second half). Helena was a fine character and was hardly upstaging Indy. Oh, she's a woman? So what. She was a thief and a manipulator and someone like that calls him a grave robber in the midst of a scene where they're insulting each other? Oh, what an unforgiveable thing! The black woman was a bad guy. Helena served as a youthful motivator of action in a way that most would have found unbelievable if Indy had done it all. I appreciate that the film didn't really shy away from Indy's age, either (though of course he wasn't as hobbled as he probably would be in reality).
It had the sense of adventure, mystery, and exploration like the first three Indy films. It also had a mix of humor in the right places and seriousness when it mattered. I thought it was perfect how Indy commented in anger on his boat captain friend being murdered after Helena was whooping with excitement at their escape -- that's just a small touch of grounding but it helps. I know some people felt the third act was quite a stretch but I thought it was pretty great and not just a pure CGI mess like the aliens in the fourth film. All the Indy films have had some fantastical element. The music, the cinematography, the characters and dialogue, it all felt like a natural extension of the first three films.
Now, maybe part of it helps that I came in with low expectations, but I think in ten years it will be seen a lot more positively.