Fire Warrior is very mediocre as a shooter the aiming is awful thanks to the ridiculous spread that most guns have, is hard to know when you are hitting the enemies and enemy variety is lacking. Also the audio mixing is just bad. But is unique experience for people who like the setting; you play as tau which is uncommon, the locations you fight in are interesting, the story is not bad and the gameplay can be fun despite how janky it is. I personally had fun during the 5 hours that it took me to beat it, if you like 40k especially the Tau I would recommend it if you can stomach the jank.
