I think EG got it right about the new map-pack when they said that all the maps are perfectly fine but none of them really stand out as being great maps. Are they all now in the standard playlists as well or are they confined to the dlc playlist?|
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