The Washington Post features two remasters reviews: One touting the Beatles in Stereo box as the way to go, the other saying bring back mono.
Me? I say you need both. Some tracks simply sound better in one format or the other. And, if you listen to the Beatles a lot (which, I presume most of us here do), it's fun to, um, mix it up mixwise--sometimes putting on Sgt. Pepper in stereo, sometimes in mono.