Has something gone awry with Gmail's spam filters?

The last week or two I've been absolutely inundated with obvious spam emails to gmail. These emails have blocks of similar email addresses in the "To" and "CC" lines and are blatant phishing attempts and/or attempts to get you to "unsubscribe" to verify the email address is in use.

I'm curious if anyone else has experienced this with google mail recently, and if something has gone wrong with their spam filters.