Tizen will never be THE competitor to Windows...or Ios...or Android....they will always be relegated to a position behind the leader....far behind....
It is the nature of the market.
Even though a major corp is behind tizen...
It is too alien for the public at this point...possibly for a long time to come.
Toe to toe...
whatever is going to contend with the industry leaders...
MUST look and perform (at least on the surface) just like the competitors...otherwise the public will not glam to it..
too radically a change from the offered norm will not fly.

line up home screen shots of out of the box android, ios, and wp ..
and there really isn't a lot of differences with what you are looking at...
They all scream they are offering a unique experience while selling the exact same thing as the other..
I don't think it is even a good sales pitch frankly...