Re: Why do some instruments show bad playing more than others?
I think there are lots of factors that play a role here. If we're just talking about the guitar itself, I think along the lines that pickups with less output and brighter tone are the ones that will show your mistakes (just like a tele). I think that this is so, for example, b/c you don't have a high output pickup masking the fact that the player may not be great at dynamics or even picking technique (masking due to compression) and the treble really brings out the mistakes (string noise,etc). These are just two factors. Now, with different amps, the whole thing changes. This is just my .02 cents worth, YMMV.
Mark