Personally, I love the parliamentary procedures in the UK system.
However, there’s a reason that there’s more money available in the US then there is anywhere in Europe. The US Supreme Court put it best by saying “Money is speech”, because their absolutely right. Limiting campaign funding is a (severe) form of censorship. The McCain-Feingold campaign finance regulations are discriminatory and unconstitutional, in my opinion. They’ve done an excellent job at further marginalizing third parties, which has certainly made the Republicans and Democrats happy.
As Cliff mentioned above, the main issue is voter malaise. When it comes right down to it, most people in the US (and in western Europe, to a lesser extent) simply don’t care who is in power. The fact is, even in the midst of a severe economic crisis, we’re simply rich. As long as the parties that are in power do what they can to maintain the status quo, the majority of people just don’t give a damn what happens.
Think about it, do you care more about your personal day-to-day lives or what’s going on in government? The only things that make us care are when something going on in government directly impacts our lives (hence, the recent interest in legalizing marijuana, for example. lol)