I won't go through all the various interesting aspects of the play brought up by the casting, having the two male admirers of the twins played by actual twins brought out the parallels between Orsino and Antonio. Having Viola played by a man brought out - well, a bunch of stuff there's no need for me to plonk through, but I thought it enhanced the play quite a bit. I thought it universalised the tensions in the play.
There was a lot of music, not of a deep kind, Feste the Jester was a lounge singer with a piano, and the play's songs were all included.
I thought it was fun, funny, kept some of the sadness, gave you something to think about. Not mind-blowing, but very enjoyable from start to finish, passed in a flash.