Leaks in Gmail Spam Filters?

Recently, I have been receiving a lot of spamy emails into the Gmail inbox.
The emails include the "trusted" domains such as "yahoo.co.uk", "yahoo.co.in", some kind of singapore domain, and a lot of hotmail domains.

I have been posting the leaked messages into a blog:BAD SPAM
However they do have some characters of spams: All CAPITAL subject lines. Same kind of start line etc. etc.

One of the reason why I shifted to gmail was the fact that Gmail spam filter used to be (may be is still) strong and very intelligent.

However, in the case of spam, false positive is very expensive.
So, I need to label them manually.
That means the spam filter still has to learn a lot and the leakage will pertain for some more time.