adamzs: I might be stoned for saying this, but I liked the Fallout 3 DLC more than the New Vegas ones. While I appreciated the serious themes cropping up in the NV DLC, somehow I still preferred the whacky surrealism that FO3 DLC had going for it. The Pitt probably takes the cake for me with the batshit insane Mad Max setting and that frustratingly-fun steel bar collection quest. Operation: Anchorage and Point Lookout were among my favorites too.
The exceptions to the above rule being Mothership Zeta for FO3 which I thought was rather awful, and Old World Blues for New Vegas which I thought was exceptionally good.
The Pitt and Point Lookout were exceptional, really. Some of the best DLCs to ever come out to this day. I thought Anchorage and Zeta were both terrible though, and Broken Steel just a bunch of endless combat for the most part. Those were disappointing.
On the New Vegas front they're all interesting, at least. I still have not played Lonesome Road, but I quite enjoyed the first three. Old World Blues is by far the best overall from both games.
I dunno, I would call the whole thing equal I think.
anjohl: I just finished Honest Hearts, and I have to say, I am completely in shock at how short it is. I bought the Ultimate Edition, so I feel I got my money's worth (Despite already owning the base game), but I swear I completed the entire DLC in 2 hours.
It was fun, but I was hoping for a lot of Mormon content, and other geographical and cultural references to Utah's history. Maybe my expectations were too high.
Honest Hearts was pretty much 100% exploration, not much story content there. If you only spent 2 hours there you missed a ton of stuff.