The Democratic Party would be more progressive, if they didn't have to compromise with Blue Dogs and moderate Republicans to pass laws. But those folks exist, and they need some of their votes to pass bills. They don't get to march Republicans out back and shoot them.
Democrats in congress are NOT just like the Republicans, but they can't just ignore them. If the Senate seats go to the Democrats, then the whole government has a chance of fixing some things that were broken. If not, then Biden and the Democrats will be severely hobbled.
We shall see on Tuesday, or maybe a few days later. Considering all of Trump's efforts, the result might be clear on Tuesday night.