Doesn't Silva win?

He mostly won. He didn't discredit MI-6 totally, though he certainly damaged their reputation, as you mentioned.

Time wounds all heels.

M dies with honor, plus she outlives Silva.

Silva loses. Bond wins.

What no man Can give ya. And none Can take away.

Yes, in the context of his objectives Silva wins. Bond gets a bronze for surviving the 'plot'. M... M spent the entire movie being dragged from one ridiculous subplot to the next in a geriatric muddle. She said it the best towards the end.. I f'd this up, didn't I?

Not really. By the time he saw M had been wounded and was dying, he broke mentally.

Suddenly the "out for blood" vengeance turned to sadness and despair. He wanted to die. Mind you he decided a joint suicide was now the best way for him to get peace, but that was stolen from him once Bond cut him down.

He won, although it wasn't the humiliating public death he wanted. Instead M died peacefully in Bond's arms, with dignity. In fact, Silva might have died thinking M survived.

Silva is the one Bond villain who actually succeeded in his aims.

It's that man again!!