I’m not sure which is worse: having to pay for wifi with a lousy experience (like Boingo at Chicago’s airports) or free wifi which requires you to watch a 30-second ad when logging on and peppers your web browsing session with framed banner ads at the top of each page (like Denver International Airport.)
Some airports do get it right. Seattle and San Francisco have moderately speedy to speedy wifi for free, and only require the usual terms and conditions agreement deal. But the banner ads? I can’t imagine who thought that was a good idea.