I have played shadow fight 2 , shadow fight 3 and i even played this Shadow fight arena few months ago.
to be honest i liked shadow fight 2 and 3 alot and i have played them for a long time but this Arena one i didn't like it and deleted the game in less then one week.
As a gamer I think shadow fight 2 was liked by many people as it as a all new concept embedded in a game. People also liked the successor of the game as there the graphics improved but in Arena i didn't saw much improvements and thats why in my personal opinion i didn't liked it that much.
Anyways Thanks for sharing it.