The game is fun, well made, and delivers a ton of content for free.
And then it's a grind from hell. Then it crashes. Then it is so confusing that you'll have to search the internet to figure out how to do basic things. This is not to mention the absolutely gargantuan amount of game mechanics that are not intuitive, downright baffling, and impossible to conclude the method in which to proceed. God help anyone starting this game for the first time and trying to figure out how mods work, where to get them, which ones you need, etc.
Concerning endgame content, if you like playing DOOM on nightmare difficulty while speed running mariokart 64 and cooking a 15 course meal all at the same time, without taking any damage from the porcupine you are wrangling in your garage while spinning plates on top of four full-sized silver back gorillas, and stealing honey from a grizzly bear family while all of you are riding unicycles and teaching a koala bear how to play Chopin on the ukulele, Warfare is for you.
After 1,200 hours into this game, I still have not even come close to touching all the content of this game. Because I am simply not good enough. This is the heartbreaking thing. This game makes you feel like you are trash. And it makes no excuses for that.
I write this review after leaving the game for over a year, but returning to beta test the iOS version of it. The first 40 hours were fun during the test. And then every single reason I stopped playing this game comes back to the surface.
Warframe is not a game. It is an entire lifestyle.