(Disclaimer: former employee of Rackspace) That is exactly how I read it. While Rackspace has been doing pretty well, its just not growing as fast as its competition and Wall Street in concerned.
It is a big shame though. Rackspace is one of the few Texas-born companies that managed to strike it big and still have a very egalitarian culture. They have a very interesting culture and I wish it was something that could go on; a lot of my former coworkers absolutely love that environment. But it doesn't look like it will last for much longer.