Exactly, Gmail's spam filters aren't good they are just aggressive. Getting 0 spam is easy: just drop all mail. Getting less spam while not dropping any legit mail is significantly harder - and Gmail fails on that.

Then again, I don't really care about receiving even 40-50 spam mails per day since it does not take long to scan over the subjects to double check that no legit mail got flagged. I'd rather do that then miss a mail I care about.