In "Hamlet", what is Shakespeare saying about the concept of revenge?

Well,
consider the price that was paid in order forto exact his revenge: shunned, gone mad, then
dying; good friends manipulated then murdered;mocked then murdered;driven to murder and
violence; and a mother reprimanded and killed.

In "", the
concept of revenge was much more noble and simple then the enacting of it. 
If you are to exact revenge, at least be more efficient about it, for pete's sake!  But Hamlet
wasn't-Shakespeare didn't write it that way, when he could have.  He could have written a nice,
tidy, quick revenge tale, but didn't.  That alone might hint at Shakespeare's underlying
message:  revenge is a messy, unfortunate undertaking whose price might not be worth
paying.