Assassin's Creed III
To start, I love AC games. I especially love all of the Ezio ones. With that said...
It has some redeeming qualities - Looks lovely, lived-in world, etc. - but they're easily matched by its problems.
Optional objectives (Which, considering it seems the majority of gamers, myself included, have that slight need to collect/finish everything) are a f**king mess. They're counter intuitive, and seeing as the story goes that 100% sync is supposed to be what the character you're playing as would have done during his original journey through the missions, it seems these master assassins bumbled their way through history running up walls and onto fences instead of chasing the target efficiently, and repeatedly smashing into bigger boats and opening themselves up to sinkage to try and expose a pointless weak spot rather than blasting them to the bottom of the ocean from ten miles away with their suped-up hotrod of a ship they just spent months earning the cash for.
It's a wonder anybody ever got f**king taken out.
As nice as the world looks it's pretty dull to play in. The period is a bad setting for an AC game. The buildings are all too small and spread out, and there's no reason to get up onto the rooftops, especially as there always seem to be shitloads of guards up there meaning you get spotted pretty much straight away. And even when you're up there you end up having to come back down again after ten seconds as there's no way to get across the f**king road. The climbing/free-running mechanic has been royally f**ked-up this time too. They've tried to simplify it, and in doing so have made it even more frustrating than it already was. They'd just started to get things going in the right direction in Revelations and decided to throw it all out. There's a guard round every f**king corner too, so as soon as you try and run away you get spotted again at every turn. Chases can go on for hours.
The frontier is boring as s**t too once you get past the initial "Oh, cool". Tree climbing is pointless as you can only climb certain types of tree, so rather than just being able to climb a tree that any ten year old boy with polio could climb to get that feather up on its branch, you have to backtrack half an acre just to find a f**king rock or tree with knobs on to get up there.
Hunting is boring, the horse is slow and there's far too much space between anything of interest so it just leads to a lot of pointless wandering.
Connor is a miserable, boring c**t. I'd have much preferred using Haytham all the way through. He may have been a bit of an arsehole but at least he was interesting. Ezio was always going to be a tough act to follow - imo, along with Nathan Drake, he's the best character this genration - and they proved they could come close to another interesting protagonist, it's just a pity they made us use his douchebag son instead.
I can appreciate some of the great things they achieved with the game world itself so it at least gets some positive points reflected in the score, but all in all it just didn't work as an AC game, there's next to no assassinating for a start.
The world is a great achievement, it's just not very much fun to play an assassin in.