Enemy Front looks interesting, I welcome a return to the style of older WWII shooters.
But the gold standard for me in FPS mechanics is probably Red Orchestra 2. It is fun, tense, and realistic. And I find that after a few rocky intro hours, my in-game behavior matches that of soldiers in many WWII films and shows like Band of Brothers.
Some examples of realistic behavior are hopping from cover to cover, short bursts for suppression, and entire lines retreating once a breakthrough happens. Very cinematic in feel but also very realistic.