Fire Force is a great anime, though many would disagree, first of all the animation is great, most people jump to conclusions, saying that the fanservice is tasteless simply because it was implemented poorly just once, and I'll try to keep the review short:
The story is nice but definitely has some flaws, most villains are more or less generic but they are interesting, though this is my own opinion. you may find the MC to be less than original, which I agree with, but he definitely is an interesting character at least for me.
now then time for the flaws: the first two episodes were fine but after that it got a bit all over the place, there was barely any proper continuity and some parts felt a bit out of place, though I assure you I have read the manga and such issues will soon be fixed, the first major arc was a bit too fastpaced for it to make much sense, and other than that the show is genuinely fun to watch.