Not being able to climb on a car is pretty much immersion breaking in a game like this. AND so is not being able to open cans with sharp objects. I have no problem opening cans, it is just an example im using, and my point is that it is idiotic not to have stuff like this implemented in to a game like this.
And my "climb atop a car" argument is a pretty good concern since it is literally on the picture of the game's cover: