For people ranting about why an all woman team was sent in without military assistance, the psychologist literally states that all the teams sent prior to theirs were male teams so they were trying out different options.
Another point people nitpicked was why all of them had guns even though only one of them had prior military experience. Again the characters mention that they've been at the facility for quite sometime. They definitely received weapons and survival training in that time.
Everything doesn't need to be spoonfed to the audience, though in the above cases they still were.