Eh. I got one of the DLC for the game on the 360 and couldn't make myself play it, and got the whole game and all the DLC for dirt cheap on Steam and only beat the Zombie DLC (and hated that one) but I still liked the main game.
For this one, I'll probably get the main game at some point but I'll wait for the DLC to drop to near nothing on a Steam sale (which is where I'll be getting it, if I get it).
Yeah, I was the dumbfuck that got three of the DLCs before I realized I wouldn't want to play any of it. To this day, I haven't finished any of them. I probably never will.
It's a shame that the DLC-quality for Borderlands started out really poorly and skyrocketed with the Secret Armory and Robot Revolution... so I'd guess that a lot of people are in your situation.