I've been in a few private aircraft and listened to the conversations between my pilot and ATC as well as other aircraft. It may just be me but I was surprised at how poor quality the connection was. Is this just the case with small aircraft with less desirable radio systems?
I should imagine once you're familiar with the ATC jargon it would be easier to understand. Just at the time i was quite surprised that i could skype my relatives at the other side of the world and get a clearer connection.
As a side note, i did my work experience (while at school) at a local airfield and got to work on the radios there. (Good Fun!) The person supervising me was quick to take over me though when a pilot stated that he was landing with a problem with the landing gear!