Not in this case, Weimar Germany used proportional representation.
I personally think that proportional representation is superior to first-past-the-post, but actually you could argue that PR played a role in Hitler coming to power. PR systems encourage multiparty systems as opposed to two-party systems. Multiparty systems can sometimes produce great political instability when nobody has enough seats in the legislature to form the government, and then there can be weeks or months of backroom dealing to try to form a coalition government. It is a scenario which commonly occurs in a number of countries with proportional representation (such as Belgium, Italy, Israel), and it was in that same scenario in which Hitler convinced the President to appoint him to power.
(Germany now and then is a parliamentary republic, the President is a non-political figurehead, the Chancellor is formally chosen by the President but the President is supposed to choose the leader of the largest party or coalition in parliament.)