I adore playing the music of Bach and Mozart (especially the Bach! It's glorious!), but at the same time, it makes me feel so inferior as a pianist. You see the wonderful thing, and the thing that makes it so difficult to play well is that it's so transparent. If you make one wrong note, or misplace the weight of your finger by an tiny degree, it stands out, and it sounds wrong. In short, you have to play it perfectly. When you're playing something really Romantic, like Chopin, you can get away (if you have to) with a slip, here or there, and most people won't notice. Not so with Bach. You have to be precise. And that precision, is precisely what makes it so wonderful to listen.
*sigh* I'm not there yet.