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Inconsistent touch control
Windows 8 is very versatile with both the Metro environment and the legacy desktop. The latter makes it possible to install any legacy Windows program you need, but that comes at a cost.
The desktop environment works with touch control, a critical part of the tablet user experience (UX), it doesn't work particularly well. The Metro side of things handles touch control nicely, but when you slide over into the desktop it is not so.
Sure, that's largely due to running old apps not optimized for touch but it's still jarring when you switch back and forth. It's necessary to do that due to the lack of touch apps for Metro, and that needs to improve.
Third party accessory ecosystem
We love our gadgets, and we love accessories for them. Those accessories range from simple cases to protect them to electronic gizmos to help get the most out of our tablets.
The popularity of the iPad has triggered the growth of a huge accessory ecosystem. You can choose from lots of keyboards, cases, and unique accessories that make using the iPad better.
There are blood pressure monitors that plug into the iPad to help track vitals, and scales that track your weight on the iPad.
The Android ecosystem trails the iPad but major accessory makers are starting to produce cases and keyboards for major Android tablets.
That's not the case for Windows tablets as you are reliant on the tablet maker to produce a case or keyboard, and that's not common.
Third party keyboards
Onscreen keyboards are essential for using a tablet and having a good one can make the UX very good indeed. Both Windows and iOS are stuck with the keyboard that ships with the OS, but Android has a lively third party keyboard environment.
Finding the keyboard app that works well can greatly improve how well things work, and it would be nice if both Windows and iOS would allow using third party keyboards.