To me, Firehawk is a fun ride, yet not worth the long wait that is almost always present. I would give it a 7, while fun at first, it lost its charm on me after the first few rides.
While it isn't rough, the final flip into the brake run can be rough on some. My shoulders tend to hit the restraint a little bit at that point. Other than that part, the ride is very secure and worth a try.