How mascara performs on you really depends on what your lashes are like naturally. So here is a little story about mine.
I know that I am lucky--I am blessed with great eyelashes. They have been thick and long since I was a child...I was always afraid that they would fall out or get thinner as I aged, but they are still here (and I'm almost 33.)
My lashes are mostly black (dark brown?) with blonde tips, so wearing mascara is pretty important so they look normal. I have a very thick row on the top, it's bordering on a double row.
I never use a lash curler, but I think my lashes are naturally a bit curly. I used to wear mascara on my bottom lashes, but a rarely do that now.
I will eventually post a picture of my lashes (with and without mascara) once I finally figure out how to use my hand-me-down digital camera.