All the points that have been brought up so far for owning a colubrid seem to be their flexibility when it comes to husbandry. How forgiving they are to mistakes made by the owner. Makes me feel like this thread should be titled "Best snake for negligent pet owners?" (Nothing against those who own them)
I don't feel that there is a specific beginner animal. Everything is relative to the potential new owner. What do THEY want in a snake. What can THEY provide that snake in the terms of care. How much effort do THEY want to invest. Its up to the person buying to do the research and make the appropriate decision to fit their unique situation. Because some people fail miserably at this does not mean that it is the snakes' fault.