Broken steel for added content to the already present capital wastes
Point look out for its great atmosphere, plus I go to Point look out in real life so it makes the experience alot better.
I feel like interesting moral dilemmas as well as morally ambiguous characters make for really great story-telling elements and are apart of what (sometimes) makes fallout really fun and thought provoking. the main storyline seemed very biased towards the 'good' faction, the brotherhood of steel, as there was no way to work more closely with the enclave. and going against the brotherhood has little reward.
I think the next fallout should introduce more moral ambiguity to make fans really think and consider each decision they make and who they ally themselves with.