I, too, tried the Campmor rain cape and also got wet. It leaks.

So I went and bought a vinyl rain cape from e-bay, from a vendor called the Monkey King. They still sell them there, but there prices have increase quite a bit. I think I paid $30, they're $50 now.

No leaks and it's a better design. Definitely more protection in the front than the Campmor. Like the Campmor, it's usefulness declines as the wind picks up. Still, I keep it in my bike bag all the time.