I think Audino misses the point of being Mega-evolved somewhat. As shown in this Pokémon Omega Ruby and Alpha Sapphire trailer from Gamescom in Cologne, Germany. It doesn’t actually get more threatening or tougher looking. It actually gets cuter.
But then again, Audino, generally takes a healing and support role anyway. The Mega Audino adds Fairy Type to its Normal Type when it evolves and gets a boost in defense and special that makes it a good backup in double battles.
Pokémon Omega Ruby and Alpha Sapphire are coming to the Nintendo 3DS November 21.