Also OWB has the best humor and amazing SCIENCE! feel attached to everything; Dead Money has great survival horror feel; Honest Hearts has the best moral choices IMO, even though Lonesome Road choices affect wider areas.
The science side of OWB is what really pulled me in, as my char. is generally a science geek(with a BIG ASS gun
By far my favorite piece of DLC ever, this is souly MY OPINION, so please respect that.
As for HH, it's gotten mixed reviews, even by me.....
The first time I played it I had basically no clue who Joshua was nor anyone else. I generally only cared about getting that bad ass .45(you know it is) which left me with a decent quest line.
My second playthrough I did in fact have a desire to pursuit the legend of the Burned Man, and with that sense of trying to get the full story I ended up enjoying HH MUCH more.
If you(op) havnt begun the DLC yet I would STRONGLY suggest playing in order as many have already said.
I started with OWB, and ALOT of the content didn't make sense.
Example(no spoiler): you quite easily come across Elijas' Advanced L.A.E.R, I figured it was some guys gun which some how or another ended up there.... Turns out Elija is far more important/ involved than I could have ever guessed.
What I'm trying to say is that when the dlc is played in order of release it adds to make a FAR more immersive/ meaningful experience, IMO. Just be sure to ask questions just like the smart man you are(lolz) and things will make a whole lot more sense.
Ooooooooooooooh!!! I almost forgot.... DO NOT start Lonesome Road if your at any level less than 30.
I started LR when I was level 42-43 I believe, very well equipped.... I got utterly DESTROYED!
LR was the only time I literally needed to turn down the difficulty from Ver Hard down to casual. Just sayn BE PREPARED.