I agree, easy, at some point I felt that I didn't need to too much to fight the fragmented one so instead of actually playing the game I just went to front face the boss on melee without giving any attention to whatever else, the only thing that needed my attention was looking for the boss when he moved, the previous missions, including the ones from the last week, weren't that different, here is a clip.
And this is supposed to be the hardest content in warframe, and I'm not even asking for something that kills me 6 times in a minute, but at least something that makes me worry a bit about making the right decisions and playing accordingly.