I'm sure the complaints will reduce once Threshold comes out in .. 2055? The main idea here is that most apps are developed for smartphones. Having a separate OS just for tablets is silly when the popularity is so low. That's why Apple and Android gets away with tablets - they have a much larger user base AND access to the smartphone store.
Certainly, that was my sentiment as well when I bought the Surface 2. It was light, had a good battery life and filled my productivity needs. Windows RT is filled with bugs though. I've experienced more crashes, freezing, bluescreens and even complete lockdowns than I can count. I even had to return it to the store once because the system crashed, some firmware got changed in the crash and BitLocker therefore decided to stop the device from starting up. Even Windows Millennium was better than RT. Add to that the lack in features, such as no auto-wrapping text when browsing, no controls for the cameras in terms of saturation etc, no possibility of installing third party apps outside of the store because Microsoft decided they wanted to be Apple, etc. And that's just to name a few.
With the release of the Surface Pro 3, I honestly don't see what purpose a Surface 3 would fill. Microsoft even halted the Surface Mini because they supposedly thought the demand was lacking. The Surface is a wonderful concept, but it's a poor execution in software.