1. Good
2. Great
3. Good
NV. Great
4. Average
Shelter. Good for what it is (it's free who cares)
Didn't play Tactics or BoS.
Edit: other than that, the lore is some of the best in gaming and media in general. The best part of the series for me is always the unmarked areas/quests/info etc. It makes the games just feel that more vibrant and real.