Weird. Haven't heard of or seen this one, I feel so out of touch. What do you like about it?
Warframe is a Shooter-game that has some MMO-element, you know, similar to Destiny. Yes, there is grind in this game.
Due to my passion for MMOs, I have tried this. Not my type, so no commitment from me. I will also be skipping Destiny 2 on it's September-Release for the same-reason, not my type.
What I like about this, is it's MMO-part. What I don't like about it, is the lack of Customization, Systems, and Contents a pure-MMO(and even Action-MMOs) can offer as a competition.
Enjoy your game! I am also aware and have red about that Open-World-news from somewhere.