I think people have different ideas regarding the term "good picture". Those (including me) who said the camera gets 0% refer to composition, light and all that.
With a half way decent digital camera with a half way decent lens - be it SLR or any other type, you can take good pictures in that sense. I have seen really nice pictures taken with a mobile phone camera! Of course you could not do large format printing with those.
And anyway, the original question was what makes a good photographer, not a good picture

And to answer that one, the camera certainly goes with 0%
Anyway, to add to thesse confusions about luck. Over the years you have many occasions where you have good luck and others where you have bad luck when taking pictures (actually luck can be regarding the weather, animals, situations)... and over the years those fluctuations simply average out! What remains is the bonus you get from your ability to decide where to go, when to go and which lens to have on, in order to optimise your chances.