I guess this was in 2010 or so, when a group of werewolves attacked my mid-level D&D 3.5 PCs. The fight was great at first, and I enjoyed that the DR/silver offered plenty of challenge, but then something happened that just made me want to do this:
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One of the PCs started to grapple one of the werewolves and werewolves are actually very mediocre grapplers. The PC was not even geared for grappling. Suddenly the ferocious werewolf turned into a little naughty doggie who wasn't able to do anything remotely successfully during the grapple match. Once the rest of the werewolves had been killed, other PCs came to smack the near-helpless werewolf until it was dead. It took me a long time until I was able to have werewolves in my games again.