Because the game is great and I am a lazy ass, I want to talk about few negative aspects of the game, which doesn't make the game bad, just frustrating. other than whose two issues the game is awesome.
First is more related to Digital Extreme. They are appears to be operating with Valve time more than anyone, you can't be sure when they are going to release an update. They eventually will, but it may take from few weeks to infinity.
Second is really frustrating first 10 hours. It is almost impossible to play without veteran friend of wiki. The learning curve is very steep. This is kinda good in its own way, only those who managed to go through this remain in the game, that why the community seems nice and friendly. But it also makes it difficult to say what does the game has. Warframe has so much content and features it never tells you about that I am asking myself what is absent from the game more often than what does the game has. So far I can only think about some in-game hentai, but maybe it is in the game, but no one has discovered it yet.