Finally finished it. Fuck, I loved this DLC. Nothing in New Vegas - or Fallout 3, for that matter - felt even remotely as desolate and post-apocalyptic as Lonesome Road.
I loved the Marked Men; their origin is fascinating and their armor not only looks great on its own, but also serves as scrap for repairing any other medium armor. I hated the Tunnelers; they're more of a nuisance than a real enemy (I only took three hits from them the entire DLC), their origin is basically impossible, so they never ended up making sense to me, and they felt too random and out of place in the Divide.
The weapons? Meh, barely touched them, aside from Red Glare, which I was immediately able to fully mod thanks to the thousands of caps' worth of junk sitting around. Seriously, the amount of miscellaneous loot scattered around is insane. I walked away with nearly 500 stacks of pre-war money, and about 50 or so duct tape, wonderglue, sensor modules, etc. It's going to take forever to run around and pick up all the loot caches I left behind when my weight was too high. The shoulder-mounted SMG was pointless, I can get more done with my Survivalist's Rifle, but the Industrial Hand was fun to play with.
The best part, of course, was the end game, the meeting with Ulysses, the man who'd put the Courier through so much over the course of the base game and DLC. I loved the way Uylsses spoke and carried himself, how everything he said and did was tied to history, be it the Courier's history or that of the real world. While most people would be out for revenge, I feel like the peaceful route was the way to go, the only way to get all the answers and have a truly epic ending, regardless of how the missiles were handled. I also have a new-found appreciation for ED-E.
There. I think I kept that vague enough to not qualify as a spoiler. Fuck tags.