I tend to search for more esoteric things, outside of Husker football, I've enjoyed piecing together a HI-Fi system. The stuff I was looking for isn't at your local Best Buy, so doing research was difficult. Few articles are written about these products with even fewer being published to the interwebs. I tell you that, to explain my Google thoughts. Google, in essence, is a huge popularity tracker, with millions (billions?) of users, the likely hood of someone else looking for a rare article is far better, making my life much easier, as the other searchers will help push related content to the top. I dont know how the Bing engine works, but in my case it is not even close. If it follows the Google model, then it would reason to be less accurate on lesser known topics, due to less users, as Bing make more inroads (and I guess it has really made a dent) I would assume the searches would get more accurate.
To be honest, I remember having similar issue with goolge when I first started using that 10 or so years ago.
Edit- Just to make a point, I typed in "review of elctrocompient nemo amps" into Bing and got no results. I did the same into Google, and got the correct spelling, and links to some reviews. Now to be fair if I go back to bing with the correct spelling it will give me, more or less, the same results. I just find it frustrating that sometimes I don't know the spelling of something to get zero results, and no alternates.