If you like grindy waste your time games, this is your game. This is one of those games that is fun for about the first five minutes until you notice that the rest of the game is the same stuff over and over. Grind, grind, grind. Fight the same enemies and get the same junk rewards. It's also pretty fun to have to sit around and wait to build the parts to guns and actual Warframes for weeks cause you literally have to build each part.
Not trying to be a jerk here but you'd have to be lacking quite a few brain cells to like this game. I pity the people who have anything above 300 hours on this game.