4 months after your post, I bought it when it first came out. Pre-ordered, in fact.
I kind of lost interest and wandered away. Part of that was Splinter Cell: Black List, but part of it was LoU itself. I feel like the difficulty level on the lowest setting was too high. GD Clickers coming out of nowhere killing your azz before you know what's what pizzes me off. That, and the inability to carry more than a few rounds of ammo per weapon. I'd carry more ammo and less weapons if it came down to it, but the game doesn't give you even that option. I think 24 rounds, depending on the make and model is it. That, and if you kill someone, you think you'd be able to take their weapon (example: a soldier armed with an M-16 or variant), but you'd be wrong.
Another thing I don't like is how easily your weapons break and degrade. Not the rifles and side arms, but the shivs and other things you make yourself.
The linearity of the game sucks. For instance, in Wild Bill's "town," you have to go through a gate and then through a building; the game doesn't allow you the option to climb up and over, as one example.