What do you mean man it up? Why?
Let's get something straight up. If you are out here worrying about what people think of the car you drive, you aren't going to get very far. Not around here, or anywhere I know. Buy the friggin Miata if you want a friggin Miata.
The only thing that can man up a Miata has nothing to do with the car. Take some high performance driving education, and learn how to use the car. You can have a Ferrari and if you can't drive worth crap, it's a worthless POS.
Now, that being said. I love driving Miata's. They are tight, light, fun little cars. I have almost bought one more than once to have as a reliable run-about. Something always seems to stop me, because I know which one I want ('99 SE 6 speed, where are you!?) and don't buy the one I don't. I have this as a daily driver:
and I like Miata's.
So stop being a girl, and make your own decision.