Sometimes it is pretty good...
My sister who lives in the eastern part of Oregon state (200 miles from Portland) has nice fiber into the house. The speed is AWESOME. Sometimes over 1 gig. I live here in sillycon valley, and the local modem test command yields something around 5 up/1 down (and that isn't Ghz!).
Maybe someone will string up fiber, but I'm not holding my breath!