I thought HH was a lot of fun. it had FO3 feel, gorgeous scenery, and hot stuff for chicks to wear. I really enjoyed it.....however the story was sort of vague and a bit confusing, but the game play was very good.
Then I take it you didn't shoot Follows-Chalk your first playthrough?
Then congratulations, you get to join the exclusive "I went to Zion and didn't shoot Follows-Chalk" club, complete with a complementary T-shirt.
A LOT of people (a ridiculous amount, maybe 75%?) accidently shot him their first playthrough and ended up skipping the entire story and the entire DLC, because shooting him means every named character becomes aggressive and you're forced to slaughter them all to leave. People were like "wtf this DLC was one hour long and didn't make sense!?!" and thought it was massively bugged, so much so that the devs had to make an official statement saying "Yeah, don't shoot Follows-Chalk."
But yeah, welcome to the elite club!
EDIT: And one tip for Lonesome Road: be patient with Ulysses. He's practically the only person you'll talk to, but he's a VERY interesting character if you hear him out. He tends to speak in metaphors, which loses a lot of people and is the main reason it takes time to fully grasp Lonesome Road's meaning, but it's definitely interesting if you bother to hear him out. Don't skip his dialog, but rather try to anolyze the meaning behind his statements. Ulysses is perhaps the most polarizing, complex and detailed NPC in all of New Vegas.