Gmail spam filtering is poor enough that a lot of obvious spam reaches the inbox as well. The quality of the spam filter alone is a good enough reason to move off gmail.
I just mark as spam and move on. Maybe my email isn't on as many spam lists.
If you only get 2-3 you are lucky :)
I have almost zero spam (that isn't filtered properly). Once in a while I catch a false positive in the spam folder but that's about it.