Of course this is totally subjective. It is subject to whether someone else is evaluating you if you are good enough or if you are doing it yourself.
The problem with answering this question yourself is that most of us, most of the time invent or decide the measurement criteria ourselves.
Your driving skills is a good example. How good are you at driving? Ever notice how anybody driving slower than you is an idiot and anyone going faster is a maniac. Needless to say, we have our own measurement criteria of what ‘good enough driving’ is.
The bitter pill to swallow though is that the definition of ‘good enough’ is not up to us. It is up to those we are seeking to serve or provide. Maybe a better way to find out how good you are at driving is asking others in the car.