Now I just back into boarderlands 2 and haven't played any of the dlcs except the DnD one, but there is no way I would call the first games dlc "lightning".
I really enjoyed Claptrap's Revolution, but other than that the Underdome was terrible and glitchy, I've gotten stuck in the map on the final round of one of the final cups before. A lot of time wasted. You basically were paying for an increased bank. Maybe if they added XP gain it could have been alright. The Dr. Ned's Zombie dlc had some good humor (specifically with claptrap), but I didn't find it better than vanilla game. General Knoxx was stretched out by the long drives in the desert because of the lack of fast travel stations. It was such a drag. Have one mission left? Why not drive through 5 areas to get there, then have to drive all the way back there for part two. I spent way more time traveling than anything else in Knoxx. I hated it.
All of this stuff is my opinion of course, but from what I've experienced in the Tiny Tina dlc so far is any representation of the rest of them, it is an improvement from last time.