If Republicans Beat Obama in 2012 Should the Senate If controlled by democrats Filibusterer republican bills?

Also, if a Republican win's 2012. Should Democrats engage in Filibusterer and blocking every single piece of legislation pushed by the New admin? During the Bush years, the democrats never blocked or Filibusterer any republican bills. And Based on the way the Republicans have conducted themselves during 2009-2012. By Not supporting anything or coming up with anything but more tax cuts. Should the Senate if still controlled by democrats literally block everything supported by republicans? As an entire unit just block everything they do?