Maybe the complaint was against the UI of Bing, which isn't great, it's very busy and cluttered. The results are as good or better than Google at this point. It

Maybe the complaint was against the UI of Bing, which isn't great, it's very busy and cluttered. The results are as good or better than Google at this point. It might vary depending on use cases and how proficient you are at using either search engine, but in general Bing is a very strong competitor to Google. As for the UI, Microsoft seems to have given up an any type of UI research after the Office ribbon interface lift. I don't know how you'd improve the UI of a search engine, but Bing could stand a bit of improvement, and so could Google.