Depends how it is designed. The australian senate, before 2015 or so, used to contain enough fun cooks that legislation had to get broad support to make it through. It was a pretty decent check against the beige dictatorship. But since they updated the voting rules to prevent the cool minor parties from holding the balance, its just been a massive rubber stamp. I loved seeing randos from minor parties getting to grill public servants on whatever their constituents were complaining about, particularly firearm legislation.