I don't think it is a waste of time. And contrary to what some people have said on this board, people do change thier minds about issues.
Discussing politics helps you to make informed decisions about parties, politicians, and beliefs. This in turn will help you vote and as an informed voter you will find representation that most closely resembles your beliefs.
If you don't educate yourself and become involved in the process then someone will vote in your place, and you might possibly end up being represented by someone with beliefs apposed to yours.
I do not encourage disenfranchised voters to just pull a lever. If you arn't educated, don't vote.
Think about it...how many people there are out there who disagree with Bush and his policies who didn't vote. If only a small portion of those voters had become involved history could have been re-written.
If you don't like the debate fine, but take the time to find out what it's all about and then vote your convictions