I really dug it.
So in relation to Fallout, it's a lot more linear. You'll definitely be finding yourself going to certain towns and completing the story in order. There's much more structure to the game than Fallout, you have a clearly defined mission.
In terms of combat, it's a square grid turn based system. You have headshots for aimed shots and that's it. Otherwise you can do burst fire or single fire. Weapons are modifiable in 2-3 stats which gives you some options. Because the combat is party based, you'll need a mix of all kinds of weapons and ranges. Shotgun people, sniper people, etc.
The game is getting upgraded to Unity 5 in the future, so you might want to backlog the game for now. If you feel like you need an RPG to play you can certainly play it now. It's a solid 80 hours.
D:OS I kept trying to go into the world and running into overleveled enemies. That doesn't happen in WL2. Plus the goals and where you should go next are more well defined in WL2. Of course, the hardest parts of WL2 are near the beginning when you're learning strategy and you're low level with really low hit accuracy.
You NEED a full party. The party kind of acts as a giant entity. You can't have a jack-of-all-trades character, you pretty much end up with 8 specialists in different areas. The party system works really well actually.