I think Windows Phones, just like everything MS in recent years, gets needlessly panned by the media. The Nokia 1020 and 1520 are both great phones. We have some employees that were holding onto their OLD (think OS 5/6) blackberries because they were simple to use, had great battery life, and had easy/quick access to email. These people don't give a shit about facebook on their phone, they just wanted a good email experience with great battery life. IPhones failed with them because of battery life/keyboard. Android phones for the same reason, plus they found the interface confusing. However, they ALL liked the 1020's and 1520's when I handed them out. Battery life on both units could almost reach the 2 day mark, longer even with the 1020's camera frame/extended battery, and the larger screen made the keyboard tolerable for them. They all also liked the customizable live tile home screen.
I honestly can't think of any significant shortcomings of the OS besides lack of apps and no EAP-TLS support for corporate Wi-Fi. In terms of user friendliness and interface I rank it right up there iOS.