Just wanted to add something: The NSDAP got 44% in 1933 and afterwards in didn't matter anymore as parties got abolished step by step (first the communist KPD an so on). Moreover the Republic of Weimar (that's how the Republic was called before Hitler got chancellor) had a proportional representation, not a majority vote like in Great Britain. The NSDAP needed the coalition with another party to get the power. So you can't really compare this.
But I really think that majoity vote isn't exactely fair, it's not really what the people wanted. But you get a strong government, that's the greatest advantage of the majority vote.
And I really believe in Democracy, I mean, do we have any real choice? It can't lead to anything good if only few persons have all power. And ideas that seem to be good (from what they were meant) just don't work (like communism, it's just a plain fact that everyone is an egoist to some degree). Democracy is the logical consequence of the idea that everybody is equal. And I can't see any reason why it shouldn't be like this. I mean you can't really find any proof that some group should be superior to another.