The very short answer is, 'Yes'. Truthfully, whether you purchase an RTR or a kit, there are a few things that MUST be done before you can even THINK about competing in ANY type of race. As noted before, examples of these things include tires and suspension. I agree with proanti1 that it depends on the individual's definition of the term 'race', and I also agree with DaveG55 that 'RTR' means 'Ready-To-Run' (for the most part) and not necessarily to the gimmick referral that some companies use, that is, 'Ready-To-Race'. Finally, as has been stated COUNTLESS times before, racing is 90% driver and 10% car. A pro with an RTR vehicle will ALWAYS do MUCH better than a newbie with the most expensive kit. It's as simple as that. There's absolutely nothing with wanting the 'best'. However, there is NO 'best' when it comes to RC vehicles. If there were, there would be no need for so many manufacturers and everyone would have the same vehicle(s). Just my opinion.
Nobody said anything about what's the best, but since you brought it up, there certainly are 'better' and 'worse' cars. It's probably not a coincidence that this article refers to probably the best RTR SC (in terms of handling and chassis at least), I would like to have seen the author do the same thing with a stock Slash 2x4 for example.
As for driver skill, when we're talking about comparisons, we're only talking about drivers of similar ability, otherwise where's the comparison? Still, having said that, I don't care if you are Ryan Maifield, I'm gonna walk up and down your RTR butt because I'm a 'decent' driver, with a well put together and adjusted car, with top of the line electronics, whereas you may be a godlike driver but simply cannot corner or go down the straight anywhere near as fast as me. If you can't catch me in the infield, and you can't catch me in the straight, where does driver skill come into it?
This is silly guys, RTR on a track? Unmodified (ok, I'll give you tires, but nothing else), driver skill or not, there are certain prerequisites in order to be competitive.
We have to be careful here not to give less racing experienced members the idea that they can take a box stock RTR, slap on some tires for the local surface and expect to be competitve, cos they simply won't be. If they are experienced drivers, why the hell would they be using an RTR in the first place? This blog is a completely flawed argument.