My pages are well written yet I see only perhaps a hundredth of a percentage of my visitors originate from Bing and usually for some very odd miscellaneous term.
I've also noticed Bing has a difficult associating words. I often put words in quotes on Google though Google tends to not require that too often.
I noticed a serious drop in Bing visitors after Microsoft employees started attacking me on the IE blog because Microsoft employees did not like my criticisms of Windows 7 on non-Microsoft sites. When someone takes a well-intended criticism and fixes a product they make their product better, when someone takes a well-intended criticism and insults the critic they lose a customer.
Coincidentally I also have seen very few visitors originate from Yahoo since after the whole Yahoo debacle ended up with Yahoo using Microsoft algorithms which is a shame since Yahoo is now nothing more than a glorified Excite/Hotbot.