For the sake of asking dumb questions, what was your feeling about the Hammerhead missions? I couldn't get the hang of the thing so I gave up on all of them. It's frustrating that they ruined Overlord by forcing intermittent Hammerhead battles.
Several of the ME2 DLCs are very good. Kasumi's, the Shadow Broker with Liara. But at some point they decided to add back in a tank - this time a hover tank - and the initial run with it (Firewalker, which should have been called "Firesinker-and-melter-and-burner.") had you doing silly crap like hop-scotching lava rivers via stepping stones that sink and jumping up mountains from slanted-topped hill to hill. Overlord had some decent fights intermixed with frustratingly difficult tank fights. Zaeed's was ok too even if he was a jerk.