Just look at the military decisions Hitler made, that was luckily an incompetent guy thinking he's smarter than everyone else. That rings a bell, doesn't it?
In the long run, making less stupid decisions wouldn't most likely have changed the outcome, but even more people would likely have died (and unfortunately the people executing the murder of the Jews weren't as incompetent as their glorious leader).
I bought it when it was in same last time and even if it's true that RPG elements are limited and you get far by running and gunning, using your hacking skills does make it easier.
I generally tend to not finish games since I get bored at some time. Cyberpunk is one of the few games that I actually finished. So I would recommend it.