1) Classic system, It's one of the systems I've enjoyed most since say SPECIAL, and to be honest, SPECIAL was better in theory than in practice, since some of the stats, and most skills were useless.(CHA in FO1, most skills in both games.) Melee is also viable in this game, which is good. Traits would make it better for me though.(And I don't give a shit about your opinion on the matter.)
2) Character creation depth, I've had fun making my own characters and drawing my own little portraits, mostly gearing up to do shitty let's plays on obscure forums with my shitty friends in the slots. This wouldn't be the same in a game with only 1 customizable ranger. Even the anorexic avatar are decently customizable now, which is good, and some combinations can look pretty cool.
3) Music, now not all of it, there was some dungeon music that I couldn't stand, and they used it in one of their trailers even, thankfully it's been toned down a lot since then. But overall it's good, and some tracks, like the main theme, are gold.
4) The combat, it has issues, mostly in the form of stupid bugs, but I've found it enjoyable, could use more depth, although it does definitely have more than it did.
5) Portraits, they look great, especially on the creatures.
There's my 5, here's 5 more because I can:
6) The robots, they're varied and interesting, like their designs and love fighting them.
7) The death animations, I know they're relatively new, but that just makes me love them more, partly because when I asked about them a bunch of forum fags whined that it wasn't important at this stage, cue a few days later and they were in. Not perfect, because they rely on crits and are seemingly random, but damn if they aren't satisfying. And I think one of them is the overseer's death? Lol.
8) Text descriptions of items, objects and of enemy moves, I'm not above laughing at honey badger ref.
9)Size, game is really big, since I like a lot of the content this is a pro for me, especially compared to the 14-15 hour games I've played recently. 135 hours logged in game currently.
10)Kickstarted the incline, although I like W2 I was also supporting it's successors.