I've been replaying the game mostly so I can do all the DLC that I've missed.
I finished the Firewalker, Katsumi, and Overlord DLC so far.
Katsumi was ok. She's a decent character and the her loyalty mission wasn't bad. A little simple and straightforward.
Firewalker was good. I enjoy the Hammerhead and it's silly platformery aspects. Nothing really special about the line of quests. Seemed mostly a setup for...
Overload was great. I really really enjoyed the line of quests and the locations it took me. Destroying the radar was awesome and Shepard's reaction to the falling debris was hilarious. What I liked the most was uncovering the truth behind the VI revolt. It's pretty obvious everything is not as it seems when you start. Especially when you have the VI screaming unintelligible words at you. The whole thing's got really good variety. One part you're jumping over lava on rocks then you're creeping through an empty Geth ship. Then finally shit goes wacky at the end. Loved the NEO-esque finale. Really really good stuff.
I'll probably play the main game a little further before I tackle Lair of the Shadow Broker. Aiming to play it next weekend. Wanna save it as I hear it's the best of the DLC.