in terms of control (both the car and myself), i've gained a lot of experience in the 7 years i've been driving. when you're 16 or 17 you've got the reflexes but not the common sense or the raw experience that only time can help with. i'm sure i will improve further as time goes on, until age starts messing with my reflexes. how many 16 year olds can pump their brakes properly (not just know how to do it, but can actually do it in a panic situation)? or correct oversteer at 80 MPH on the freeway when a couch suddenly materializes 50 feet in front of you as cars head for the ditch? i think most kids can do that stuff when they know it's coming, like when you purposely charge around a corner or whatever, but making those things second nature in a panic situation doesn't happen overnight. we're all still learning as far as that stuff goes.
as for courtesy, depends on my mood. i won't do anything dangerous regardless of the situation, but i will pass on the right if some moron won't move out of my way, and i will honk if someone sits at a green light. if you cut into the safety space between me and the car in front of me, i will blast your ass with my high beams until everyone in the vicinity knows you're an ass. i drive fast and corner hard, but i always keep my safety space and will not corner hard around a blind corner, and i'm willing to sacrafice speed to make sure i don't put myself or others in danger. if i can't drive with cruise control, the cell phone stays in my pocket, i won't call out or answer it. because i scan for police constantly, i always know where everyone is and how fast they are going relative to me.
so i'd say i'm a good driver. but i know perfectly well that i'm not perfect and i'm no race driver.