Every review I read uses OS X iCal and Address Book as examples of the worst aspects of Lion. This one is from Macintouch... (emphases mine)
... Others, including iCal and Address Book, are downright horrid to use, no matter how pretty they may look. It's as though everyone at Apple was given the directive "make it like iPad", but nobody coordinated the ensuing work...
iCal was awful in Snow Leopard. I didn't think it could get worse, but it is. Address Book was never a great app, but now it's moved into the "horrid" range.
In my use of Lion I get the same feeling of uncoordinated work. Some features seemed aimed at power users, others at people who'd never used a computer before. There's good work, but there's also the kind of incoherence I expect from a Google or even a Microsoft product.
This is, most assume, the first version of OS X where Steve Jobs wasn't available to enforce a narrative. It's a sign of what Apple is likely to be post-Jobs -- less like the Apple we know, more like Google.