No, because I don't live in a country that only has two parties.
This is key. My country (Canada) has three main parties. Of the three federal elections I have voted in, I have voted for two of the parties for precisely for this reason (Liberals and NDP). I lie somewhere between those two parties, and favour having either of them in power over the Conservative Party.
However, if both the Liberals and NDP were
both to have been shown incapable of governing in a prudent manner, then I would be okay with voting Conservative, as it wouldn't be the end of the world. I didn't agree with Harper, but Canada still exists after his 10 years in power, it's not the end of the world to have the opposition win.