Frustration and shame for all linguists

Rating: 1/10 (28 January 2020)

I'm deeply frustrated with this movie. It seemed to be original, but they really missed it.
Its main character is a linguist. Earth is visited by an unknown alien fleet that lands in a dozen places around the globe, just like in Independence Day. For some reason, they travel to Earth and land, open a hatch so humans are allowed to enter their ships, but aren't prepared to communicate with mankind at all, they just stay still.
Louise is called to try to communicate with them. Everybody in the world were failing in any attempt, and all she has to do is show them a board with a word written on it, and they decide to also start providing writings. Haven't anybody on the world tried that before?!
What really made me mad with this movie, is that together with her they called a mathematician. But he, instead of obviously asking to use basic math to communicate with them - it's believed to be the common universal language, that any intelligent life form would understand -, he tells her to ask them herself some complex math questions, like if they are able to travel faster than light. He looked so dumb, and was immediately forgotten in the plot.
The ending is also very dumb. For no apparent reason, a chinese general decides to declare war against them and other countries to follow him, and she becomes a world hero just because she phones this general and convinces him to give up.
That's it, seriously!