1st Negative Review Summary - Warframe

The game does a bad job (if any, at all) at teaching its players the mechanics and whatnot (e.g: the damage system).
The developers don't work with the community, they work against. When a change is implemented they do it in a half-assed manner or in a way that isn't entirely beneficial to the player (a spell's strength being buffed but otherwise nerfed to the ground, the implementation of universal vacuum with a range half of the default, etc.).
Missions whose enemies scale or are way stronger than you are not worth it because there isn't a good reward for that challenge.
The game's forums are heavily moderated, discussions happens elsewhere. Special players of the community can vote for things to be added into the game, but it's on track record that DE ignore the votes verdict sometimes.
They shoot themselves in the foot, and do not learn from their history, which is frustrating.