Kit lenses are the best to start off with as a beginner, which I do not see in any way inferior to other lenses. Personally, I've been shooting all this while with my kit lens. I'm sure there are many CSers out there who start off with their kit lens and doing pretty well too.
Concept-wise, it's not about how good the equipment is... coz if your foundation sux, you won't get good pictures even with the best/higher end equipment on hand (e.g. 5Dmk II, D3, etc etc...)