If you have already stated your concerns and complaints via other forum posts, in-game chats, etc., and believe that you have said your piece, then it makes sense that this would be the ultimate choice if you have felt unheard or brushed aside. Best of luck to you in your MC adventures.
If, however, this is the first and only action taken, then it seems a bit impulsive and disrespectful to the HC community to just leave without expressing yourself first about the foundation for your choice, especially if it has to do with the politics of a game you have many fond memories of. I'm sure that the staff at HC would appreciate the feedback of a veteran that has made his presence known throughout the community as HC has evolved, developed, and changed... and will continue to do so for the duration of its existence.
May wisdom be on your side, Xexo