Actually, your chart could serve as a good start for other experienced snake owners to submit their own ratings, perhaps leading to averages that would represent consensus ratings.
I once thought about learning how to set up and online survey/database, but then I started looking at the some of the posts on these forums. You see an "expert" giving detailed advice to someone, then you scroll down and see that the expert bases their expertise on having a cornsnake named Sasha and a cal king of unknown gender.
I am afraid that too many inexperienced people would give misleading or biased input - "I have a Mangrove Snake and they are the best! They are much better than Cornsnakes!"
One suggestion would be to either modify the "handling" definitions, or omit that category (since it's covered somewhat under temperament) . As currently defined, a retic is easier to handle than a rough green.
I actually kept that separate deliberately. While a Rough Green is not likely to bite or hurt anyone, they are not a snake that tolerates handling well and they are very fragile. Many Retics, on the other hand, can be reasonable easy to handle until they get too large. You will also notice that I gave milksnakes a bad handling score. My Black Milks are great handling snakes, but most people's first exposure is going to be with young Hondurans or Pueblans, neither of which deserves any special recognition as a handleable snake!
How about setting it up similar to the way Consumer Reports rates all of their stuff, i.e., a 1-to-5 scale for each elemant ranging from much worse than average (1) to average (3) to much better than average (5).
I kind of did this, except I qualified the basis of what average, worse than and better than mean.
This is sort of a reverse of your numbers, but only in the sense that a higher score would be better instead of a lower one.
I originally started this way (high=good) but it makes it harder to incorporate variables like size and costs as they are already inversely proportional to the appropriateness of a snake as a starter. That's why I stuck to a low=good strategy.
I would love to see it incorporate the experience of other "experienced" herpers, for example, people with more than 100 snake years of experience (sensu Dave Barker). I guess you could restrict voting to species that you had more than 1 year experience with and had experience with more than two individuals (i.e. you can't cast any opinions about snakes you don't have enough experience with). Of course, there would be no real way to police this.
Without that sort of restriction, I would be worried a few biased newbies would skew the scale to see their favorite species "win". Many of my favorite species didn't score well, but that wasn't the point of putting it together.
Also, less common species that are great beginner's snakes (Dione's Ratsnake or Russian Ratsnakes) would fall way down the list because few people had any experience with them.
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Chris Harrison