- Your companions can't come to Zion on the caravan. There's only one seat left and for some reason you cannot convince the caravan master that any of your companions are better choices than the drug addict with the broken Pip-Boy.
- After entering Zion, everyone along with you is shot to pieces. There's nothing you can do to stop it from happening, and the event does not pause gameplay, so there's no indication to the contrary. If you're like me, you played through this a couple times before narrowing your eyes at the screen.
- You cannot leave Zion without a map or directions. Forget that you have a Pip-Boy and a survival skill of 100.
- There is no "player housing" option in Zion (at least not an indicated one), despite the fact that you're defending the natives over a short period of time. Hence, your weight limit is important here, and if you're anything like me you don't want to throw things on the ground and risk losing them to an "area reset". This is terribly unrealistic, because if you actually arrived there, the first thing you'd ask is "where can I set my things?" or "where will I be staying?".
- If quest NPCs die, you get a new quest called "Chaos in Zion", in which your objective is to retrieve a map that you cannot otherwise steal. After doing so, you cannot do any other quests in the DLC and thus cannot acquire some unique items. You also lose out on plenty of gameplay that you paid for. If you sided with the Legion, which obviously was intended by the devs, you'll probably wonder why killing their highest priority target, Joshua, was not something they foresaw.
- On top of his preferential treatment above, Joshua cannot be pick-pocketed.
- There were no options to interact with the White Legs, to negotiate other resolutions to the tribal conflict.
- Despite there no longer being "one seat left on the caravan", you cannot return to the DLC with companions. Companions from the DLC won't come back to the Mojave with you.
I think it's fair to say that the developers wanted HH to be played a certain way, and while I enjoyed the DLC, I will admit that I didn't fully experience the freedom of choice that makes Fallout games great.
