Unless you're standing within shouting distance of a cell site it seems like you can never stream videos or download songs without them crawling anyway. In most cases I just pause them and wait until I'm back at the office or home on WiFi.
Having 3GB is a nice number to advertise, but with the 250MB I get, I only use 90 odd MB a month with pretty heavy email and web usage.
Edit: I guess what I'm saying is, it's like offering a 100GB or unlimited plan, it's pointless. It would be nicer if the calling rates were slashed and/or you received more minutes in the bundle.