Concerns:
- Decks are often modified, so it seems unfair/misleading if it has to keep a previous rating. If ratings can be changed, there's still no guarantee that the people who rated it previously would bother or remember to update it.
- What rating criteria should be used? Some might stick with competitiveness, some might give credit for creativity, and some might give it a rock-bottom rating simply because they think the deck is cheap. Categorizing the decks somehow might help here.
- Hopefully this won't happen, but cleaning up after rating feuds does not sound fun.

I think ratings would be useful in a deck bible, assuming the deck lists are fixed. I'm not so sure about its place in a deck review forum though, where some decks are still being molded. Thoughts?