I did the 4th level solo on Legendary the other day, it was the first mission I did in one sitting (I usually get frustrated and have to leave and come back to it) and the only part I found particularly hard was the defending the area with all the turrets dotted around. I was really surprised that I only died twice during the Mantis section and the second time I died was only because I knew i'd respawn where I just did. I think the key is to just play it as though you're not in a giant machine, hanging back and making sure your shields get charged often.
XBL/ PSN/ Steam/ NNID - MatMan562

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