I've seen both types of officers (prior service, and just O's) and some have been great, and some have been awful. At the end of the day, who you are and your personality will determine what type of officer you are. If you are hard working, selfless, and determined, you will succeed...but if you are a douche bag who has been spoon fed a living from your parents, chances are you will still be a douche bag when you become an officer. Being enlisted does help some, especially being able to relate to your soldiers, and letting them know you have seen the same shit they are seeing right now. However, it can be distracting at times, because you sometimes have a tendency to micromanage....which is a big no no in the officer world.
8 years is a very long time, I would suggest that you pursue a ROTC scholarship because it is an easier transition to military life from college life (whereas being a private will be a complete shock) as giving you a chance to be responsible and lead soldiers (which is the greatest honor). You will be treated like shit in Basic training, and then when you get to your unit, you will have to live in the barracks...among many other things.
Just something to think about. if you have any questions feel free to drop me a line.