So, whoever made the decision to do this, please comment:
You obviously knew that some people were going to dislike putting polls in the front page. (People have already brought up multiple valid reasons why it's a bad idea in this thread.) Making it possible to exclude polls from the front page should be trivial -- most obviously, just create a new "poll" topic and then existing options can be used to exclude those from my news feed. So why didn't you do that?
Every time there's a controversial decision in regards to Slashdot, the editors are always quick to claim that they're trying to do what's best for the users. But decisions like this make it obvious that you're not. If you actually were considering what your readers want, you would never have made this change without at least providing an option to turn it off.