I've just created those in the past few weeks and so far they are catching a great deal of the spam I get. In fact, much better than I expected. I'm still testing and tweeking. I've change the first rule to Any Recipient to see if that will get more of the spam without junking wanted email.
In SL, I had a rule where if a recipient contained a comma (which denoted multiple addresses), it would delete them. I figured if someone I didn't know was including me in a multiple listing, then it was junk. But, Lion will not recognize the comma or any other punctuation and I can't get that to work.
I'll be testing and looking for any others I can add if too many others get through. Once I get a rule to work like I want and know they're working to perfection, I'll change the actions to just delete them.
Try them out and see if they fit your needs. I mark them different colors to know which rules does what action in case good emails get affected and I'll know which to change.
As far as the discussions, I think the options are that you can only mark 2 posts helpful and one solved. But I appreciate it though.