I am happy with my representatives, they have consistently fought for the things that I care about. The ones I have the most beef with are people like Schumer, Reid, Pelosi, who represent a different constituency.
I can certainly sympathize with those that feel like their vote doesn't matter. Obamacare was doing poorly in the polls before it passed, it passed with no Republican support. That tends to make people feel like their government doesn't represent their interest.