According to consumer reports, the opposite has been true for a long time. Dell used to have terrible rates, and as of the last study, was doing poorly for desktops, but near the top for laptops. Apple consistently scores the highest for laptop reliability among all companies.
That's not true. According to the 2009 Consumer Reports Buying Guide (page 221), Apple laptops had the lowest reliability (but not "meaningfully" worse) among the eight companies listed from their Annual Product Reliability Survey.
The data was based on 75,576 survey responses and showed "the percentage of the following brands of computers bought between
2003 and 2007 that have ever been repaired or had a serious problem. Differences of less than 3 points are not meaningful." The brands, in order of fewest repairs to more repairs, were: Lenovo (20%), Compaq (20%), Sony (21%), Toshiba (21%), Dell (22%), HP (22%), Gateway (22%), and Apple (23%).
The buying guide (and other Consumer Reports articles) can be downloaded for free by most public library card holders (EBSCO database).