I'm at about the halfway mark, and while the game is overall good, it does have a few negatives that I've seen, some of which I would venture a guess are indicative of a product the company wanted to push out the door as quickly as possible (Konami wants to be a "big boy" gambling company now, you know. With pachinko instead of kiddie video games).
The game purports to be open world, yet appears to be constructed of numerous environments that are filled with "invisible walls", meaning you can see the surface but if you manage to get to it you will find your progress blocked. Many of the "mission areas" are arbitrary and if you are driving a vehicle don't give you adequate warning that you are "abandoning the mission" should you not stop the truck in time. The dog buddy frequently and deliberately runs directly in front of the vehicle you are driving when you first start it, meaning you have to waste precious seconds in timed missions or else risk harming your companion. The vehicle collision detection and gravity settings are wildly unrealistic, creating scenarios where a small Jeep can send a large supply truck flying through the air if the AI decides it wants to go where that truck is.
And of course there's the fact that Konami took the entire third section of the game and just axed it, leaving a gaping hole where it should have been.
Is it a bad game? No- the developers who suffered through slave-labor conditions at Konami did the best they could. Is it frustrating, buggy and unfinished? Yes.