Unity's soundtrack is excellent and the sounds of the baying lower classes gives Revolution-era Paris its sense of place and time. Looping lines of dialogue during missions are crap, but otherwise the voice work, despite being comprised of regional British accents for some reason, is solid.
Frequently jaw-dropping, Assassin's Creed Unity looks stunning when it's not bugging out and hurling silly glitches at you. Character models are generally good, but some NPCs look flat and generic. Quantity trumps quality here.
It could have been so much better were it not for some shonky game mechanics and irritating combat. And guess what?! Unity's many bugs will no doubt spoil the party for you at some point too. Eagle Vision has cooldown now though, making it less open to exploitation, which is nice.
Unity is a vast, vast, unbelievably vast game, even if it is mostly grey slate rooftops, drab palace exteriors and muddy cobbled streets. You'll find activities by the boatload, as well as far too many collectibles to find, if you're so inclined. And if you can face some pretty long loading screens.
Collect all of the things, complete all of the things, do all of the things, and you'll get all of the achievements. Boring.