Yes, a Model 3 is not a sports car, and there are a number of sports cars out there that I think are more fun to drive than an M3P. What the Model 3 Performance is, is an outstanding sports sedan, probably the best made today. Personally, I'll take an M3P over an BMW M3, an RS5, or an Alfa Giulia Quadrifoglio, which are the next best sports sedans. M5s and RS6s perform outstandingly well, but they're so big and heavy that they lose the sporty feel of a smaller, lighter car. And, it certainly doesn't hurt that the Tesla costs tens of thousands of dollars less than any of those others.
Of the American cars other than Tesla, the Chevy Camaro is a pretty fun drive with a well sorted chassis, good steering, and plenty of power, but it's not a sedan and has minuscule back seats. Also, I really don't like the looking out of a mailbox slot feeling that it has with the very high dash and low roofline. The V6 Camaro is the best handling variant, but while it has decent power, it's nothing like the Tesla. The V8s have good power although it can be difficult to get it to the ground and they're a little nose heavy which hurts the handling. I think an M3P is more fun than either version.