"many different parties"?
Let me put it this way: I noted years ago that Jacques Chirac in France was elected by less than 5% of the eligible voters in France. This was because there were about 20 or more different names on the ballot for president.
You think our elections are bad now? What do you think it would be like when your House representative garnered the support of only 500, out of, say, 500,000, voters?