I've not seen any hellfires in person. I have seen both the lightning trucks and the ofna trucks. They are very impressive and both get around the track very well. I've drivin the lightning a bit and it was very much fun and easy to drive.
The revo is a straight up monster truck. Not the same class as the truggies/arena trucks.
Not lame at all. Better to ask questions and make a well informed decision when it's time to buy.