The size is a big turnoff for me, which is a shame because I love what Moto did this year overall.
Personally, I think Moto's data collectors have no idea what they're doing. Most people are buying larger phones because all of the premium phones are larger phones! There are no mid-sized premium phones to see if people would go for them.
Motorola's "researchers" also said that the reason why they didn't put an SD card slot on the Moto X was because their research suggested most people ended up uploading things to the Cloud. Well, if you don't give them an SD card slot, what other choice is there? To me, it seems that their research and data collection methodology is way off.