I've now finished the LN (well, as far as I can; there's no official English release of volume 14, and the fan translation of the last two chapters was more of an "overview".)
I can say that my enthusiasm is kind of
curbed. There's moments I'm still looking forward to being adapted (to include the ones I haven't actually read), but it seems W.W. gave into certain pressures, and avoided the "bittersweet ending" he talked about in interviews. And hinted in almost every volume from 1-11.
And he didn't really complete Hayama's character arc. Or Haruno's. Yui gets all these dark-sounding interludes and memorandums and... it never goes anywhere.
Not even after...
Haruno reveals "co-dependency" is afoot in the three's relationship, making Yui really, really angry.
Oh and Yukino, never reveals what the purpose of the Service Club was to Hachiman.
She drew it up to help Hachiman specifically, to fix the loner attitude she feels she caused him to adopt due to the accident.
In so far as this adapts Volume 12, which is tonally pretty consistent with what came before, I think it'll be good (Haruno introducing more DOUBT into the Service Club). After that, things get more spotty.
There's no ".5" Volumes left to adapt, so I wonder what the OVA will b-- oh God, please don't be ANOTHER...EDIT:
Here's a PV with what sounds like the new OP for this season:https://www.youtube.com/watch?v=V_Cvvl1fVBE
You can turn on auto-translate and pick out some of the words. Hikki is saying something along the lines of "We won't understand if it's not said. Even if it's said, it won't be conveyed."
I can't recall where exactly I heard him say this, though it's similar to his response to Yui in Zoku episode 8, right before he asks for "something genuine".