Managing cross national employees/sub-ordinates with different cultures & values is a fun or otherwise?

It is a Talent.

It's more interesting and you can learn so much more than if you you had to manage employees from only one country and culture. Multi cultural societies are better in so many aspects of life!

sure it isn't "fun" but it is "managed work"

Managing cross cluture employees is always a learning experience to everyone. You can find many different skills and techniques in accomplishing and job or work. Its more like hub of talent. lots of creativity and genuine talent.

Its a knowledgable experience as you learn a lot about their culture, rituals & skills.