Yes, lots of stuff. Mainly that everything is time-consuming. People go in expecting everything to be fast-paced, but it is a free game. Crafting weapons and stuff takes a while. However, everything but cosmetics can also be gotten for free, so you don’t need to spend real money unless you really like fashion.
Overall, it could be worse. But it sucks when you’re knee deep in it like any other game. However, getting started IS a pain. Warframe is not new player friendly at all.
It means that you can play the game with a gamepad, but things that require typing need keyboard use. Like logging in or naming pets.