Other than aliens, what was wrong with it?

If you look at the first scene of the movie, that takes place at Warehouse 51, it is an obvious throwback to the first film while randomly nodding to the audience by showing artifacts we have seen in the movies.
Here, the screwball comedy starts as literal CGI meerkats appeared for the "Happy Gilmore" comedy, just that they feature no purpose. This continues for a while as Indy goes towards different places, hides in a fridge and whatnot as these animals look on.

Afterwards, it becomes moreso the norm once again. Before throwing in another past love interest of Indy that features not much purpose. Again, this is all just fanservice. Coupled with the first sequence inside Warehouse 51, it feels more like a fanfilm at times as they try too hard to pay tribute to the trilogy itself, with the remaining characters being less than interesting or important, showing how little they knew about the series anymore, how much they had forgotten, and that they all made less of an effort to create something new in this universe as they had lost their ways.

The reminder of the films is very flat and features no grand traps, something that had been known in other movies. However, there was generally more action in the movies.
However, because of this, the predictability of the plot (moreso than in other Indy films), and the dragging of (mostly action) scenes, coupled with the very bad CGI, made the film look like a SyFy-B-Movie.
It was cheap, the writing was atrocious, the film is all over the place with its awful pacing, the characters are one-dimensional, predictable and boring, and it was more a knock-off from the first three movies.

There is nothing wrong with aliens in itself, we already had many religious artifacts and it just expands the universe nicely.
The way they dealt with it, however, had gotten boring and worse than X-Files episodes in this regard.

I don't even like any of the Indiana Jones films.

I think it was supposed to be like a sci-fi B movie. It was shifting genres.

It was made.

he threw a guy in a pit of ants

Then they should have experimented more with characters and whatnot. Half the time they are just chasing an item without anything happening inbetween.
B-Movie should not have been taken literally and used as an excuse to do a poor movie.

youtube.com/watch?v=-zphhfHon_I

the fridge

it literally reinvented 'jumping the shark'

This movie had Shia LeBouf swinging through the trees like Tarzan.

Aliens are the least of its problems.

PART TIME!

that town was so badly made you could tell the people in it were fake.

Not the fridge itself, but the absurdity in general.
There are many instances in the movies that are downright ludicrous and dumb, but this one takes the cake as the first 15 minutes played like a screwball comedy.