Simpler, and offers REAL opinions. Instead of Yes/No, you have a larger range of options and more realistic results. Instead of "Is Abortion Okay" having to say No or Yes in such a complex issue, your pick can better represent your place.
The fact that you can now have more then one option really makes polls a lot better then opinions.
It gives more clarity, even the most tedious poll will always have the "that's very nearly my opinion, but not quite..." option. Opinion give more freedom and thus, better information.
People give there thoughts better.