Well, I just got the game the other day on Steam, here's my experience with Manhattan so far:
I drove down to Gorka with a HMMWV (with M2) nicked from Manhattan and found the cache no prob, and reported it. I then drove around the red area west of Manhattan and found three sentry bases, but I never found the tents for one of them. So far, pretty normal. Then I decided to drive up to capture Lagushina.
Here's where it gets weird. I'm hanging out outside the church where Lagushina's car is, it's like 11:45, I'm like, this is going to take WAY too long, so I decide to drive over to the red area near Olshy (sp?). While I'm driving, I whip past Lagushina walking from Olshy to the church a couple of kilometers away! She just parked at the church and decided to skip mass? Huh?
OK, so that's weird. I arrest her, get her in the Humvee, drive her to LZ Jersey, and the heli picks her up. Then we start getting shot at. I finally figure out that the shooters are insurgents actually standing around in the airstrip, like around the hangars and control tower. I drive down there with the Humvee and kill all of them, but one of them gets a little marker over him on the map, and he's still writhing around on the ground, not dead.
I drive over there, and Rodriguez says something about how he's Nikitin. A little conversation ensues which basically seems to suggest that I can either decide to kill him or not kill him. However, if there was a way not to kill him, I couldn't figure it out. So I literally had no choice but to shoot a wounded high-value prisoner of war to death in cold blood on the tarmac of a friendly airstrip. I then radioed it into command like nothing had happened, and it completed the "Insurgent Leader" task.
I mean... I'm pretty sure that this wasn't exactly how the mission was supposed to play out, but... uh... it was a little disturbing. :P (Did I mention Nikitin pleaded with me not to kill him?) I still haven't figured out where the insurgent main camp is - that seems like something that we could have asked Nikitin, but nooooooo...
It's a fun game but the AI or the scenario or something is all borked to hell and back. :) I have this major problem in particular with the AI where they will simply suddenly refuse to drive anywhere. It seems related to team switch. In particular, in the worst example I've seen yet, I'm in the front passenger seat, there's AI driving and gunning, we're on our way to some town, I teamswitch to the gunner, and suddenly the driver stops without any order being given. I switch back and now the driver simply will never drive the car anywhere again until I order everyone to get out of the car and get back in. It just makes the singleplayer game no fun at all.