I don't think i used it once...i wish it was contextual search..
This for me as well. I've used it once when I needed to scan a QR code, but that was the only time. When I search, I usually just end up searching through IE.
How does the music match work? I tried to use it for that cos I heard it can do it, but I couldnt figure out any way to do it so I just installed Shazam..
I don't think it's useless. I use it daily and it so easy to get to. I use to use Google but the reality is, they really are both good. Better integration with Windows Phone makes Bing better I think. Also, I use the QR reader often as well as the music search "integrated shazam like function". Having Xbox music pass, I hear a song on the radio, hit search button, select the music note icon, and seconds later I am downloading that song and often times the whole album.