As far as Hydra goes, it doesn't hold many g's. But as far as thrill and level of excitement goes, it's awesome. The barrel roll right out of the station is pretty cool, too.
About Hershey vs. Dorney: If you have the whole day to ride and explore around the park, Hershey would be the place to go. If you have something else you want to do during the day, head to Dorney. Both have amazing rides though.