I am about halfway done with the game (liberated 5 districts so far), and I am really enjoying it for what it is... I never went into this game thinking it will be a masterpiece of GTA or even Sleeping Dogs scale, so I couldn't get disappointed.
It helps that I am a sucker for these "Ubi-style" open world games (climb tower, reveal map, do side missions, collect tons of crap, move to next tower). I especially derive a lot of enjoyment from tracking down magazines an other collectibles (they are useless game-wise, but at least you can "read" them). So on that front, the game satisfies me a lot, hacking Junction boxes etc.
I also really like the story, one of the very few open world games that managed to put forward a decent narrative, and I like the way they did it with programmed retrospection cutscenes.
But I need to point a couple of huge flaws that bring this game down for me:
1. AI - it is worthless. And thus makes game a lot more boring. It's just whistle, wait, kill, next one, next one, until there is a neat little pile of enemies at my feet.
2. And a much bigger problem is what I call "AC3 economics". Just as in Assassin's Creed 3 (which I hated thoroughly, but also because of this problem), money is worthless, as well as any upgrade system that requires money. With just a little patience and paying attention, you can clear the entire game with starting, non-upgraded weapons. All I use is the knife (see 1.) and whatever guns enemies drop. They are all plenty enough to take care of business (in AC3, I finished the game with only a hidden blade and a starting tomahawk). So, no reason to even bother upgrading weapons, I never even called the weapons guy.
That then brings about the pointlessness of the entire side-mission racket business. Who cares if my racket brings me 30 or 40 K, I'm never spending it anyway. So I don't even collect any money from anywhere, and still I have about 75K in my safe unspent. I have not spent a single dollar on anything in my 5 districts so far.
So, I started skipping optional missions. They are repetitive and tedious, just basically a ton of driving. I just keep going: 2 rackets - Boss - collect crap - next district.
All in all, I am satisfied, 7.5/10 easily from me.