Sometimes really good, sometimes not. For example, I took a lot of photos at two Bar Mitzvahs almost a month apart, the second one two weeks ago. At the first one I camped out next to a hired pro who had an expensive professional setup. I had my little Samsung V3 Digicam 3.2 megapixel. Most of my shots look fine except that the pictures are awful because they are looking expectantly not at my camera but at the professional's! The second Bar Mitzvah's pictures are almost all very good. It was a different situation and although there were profesional camera and video people around, I didn't camp out next to them but roamed around.
Even though my camera has an extremely inaccurate viewfinder (it shows only around 70% (guessing here) of the actual frame taken, I've come to be able to make a pretty good guess about what's going to be included in the shot and my framing very often requires no cropping at all, or is reasonably acceptable without cropping. In any case, I'm probably going to get a DSLR soon which should eliminate my having to guess about framing and will eliminate my 7+ second recycles and often horrible shutter lags.
When I first really got into photography I was bulk loading film and shooting B&W 35mm film and doing my own processing. Before that I was shooting rolls of mostly B&W 2.25". Bulk loading let me take a lot more pictures without worrying about wasting film (penny a shot and evaluate contact sheets of negatives). The nice thing about digital photography is that it doesn't cost anything to take extra shots, so you can just fire away and lessen the chance of missing out on a great shot. Of course you wind up with a lot of shots you don't care for or that are awful. So, percent of good/great shots isn't very important. The main thing is how good the really good ones are.