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Massive grind for low rewards and departure from the core game (space ninjas operating within powerful "warframes") to more and more side games such as forced fishing (yeah... fishing... LOL), mining, and most of all the requirement to play as a weak emo teenager to do the new content makes this a giant dud. Avoid.
New players will have no clue about all the required unfun side games and grinds until they are hooked and spending money.
Warframe used to be a pretty good game. Now it is just a conglomeration of inferior console-like side games. The game shouldn't even be called Warframe any more but "Console Kiddies in Space."
Also avoid their forums if you want an accurate assessment or feedback on the game. Full of white knight/fanboi FB friends of the game and the company, even mild criticism is likely to be heavily edited or outright censored under the grounds of being "not constructive."