It seems like Google does a great job filtering spam for a while and then it seems to let everything through. For about a week now, I have been getting Cheesecake Factory and amusement park confirmation spams by the half dozen. One funny thing is that the spams that do get through GMail are almost always wholesome (except for the occasional big beautiful people want to meet me ones ). Are you seeing spams come and go with GMail?
A few spams pass through the filter, that is around 2 or 3% though. I love my Gmail, it blocks everything else IT
For me it blocks almost all spam, almost all the time but than it goes away and I get 10 "Confirmation Department: Cheesecake Factory Gift Certificate" per day. I do use their "Report Spam" button all the time but the filter still takes a day off more often than I do.