A lot of the rumors that you mentioned used to be true, but now with the new technology brushless and Lipo, electric race classes are just as good or better than nitro. I've got 15 RC's, one of them being a thousand dollar HPI Baja 5B SS. I've had quite a few nitros, a lot of electrics, and the gassers. I'm said I would never go with electric because I liked the power that nitros had. Well once I ran a nice brushless system, I realized that they were waymore powerful and more fun to drive than the nitros that I have. I've even converted my Revo race project from nitro to brushless electric. A few years ago guys were struggling to make a 5 minute main on one battery pack. Now with brushless and LiPo, people are getting 30 -45 minutes on one battery.
Don't let the electric fool you, just because it's quiet and doesn't have fumes doesn't mean it's slower. It's also much more consistent than nitro, which is very important when it comes to racing. Different people like different stuff, and people will argue either way. I always swoer I would never run anything but nitro, and now I've sold off all of my nitro's but one, and I'm saving it to do another brushless conversion. The way that I look at it is like this: People will argue whether nitro or brushless is faster till the end of time. The fact of the matter is it's just like cars, it depends on the drivetrain. A lot of brushless systems are faster than a lot of nitros, and vice versa depending on the size and quality of each system. BUT, the fact that people can debate which is better tells me that brushless has arrived and is at least just as powerful, or people wouldn't be able to argue their point in the debate. Don't let those old rumprs scare you off, with brushless you can have just as much or more power, only it will have MUCH better torque and throttle response on take off, instead of having to spool up with RPM, and you can get a hell of a lot of runtime out of a LiPo battery.
If you have any more questions, feel free to shoot me a PM. I don't race on-road yet, but I have 3 Novak brushless systems and two Castle systems.