RipperJack posted the exact same comment on the warframe beta key giveaway article. He literally copy pasted it so i suggest ignoring his comment and actually check out the game yourself as its definitely not pay to win.
Do not listen to the above Poster while some items are only purchasable through platinum (Shop Currency) and its only 3-4 items everything else can be purchased with earned in game currency. Certain warframes are purchased with real money and the rest there are about 6-7 total and 2-3 are purchasable with cash only.
The game can get a bit repetitive but I found myself definitely enjoying the action and the game is optimized very very well.
Overall its a neat little gem but wont appeal to everyone.
If i had to describe it it would be Mass effect 2 ish in a light term but the feel is there.
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