Method said:
IMO you can't even judge a name, It's based on personal opinion whether you like it or not, and how much your willing to pay for it.
So you're saying that a one-letter account isn't worth very much if you don't like it? There is only 26 of them, out of the 10's of millions of accounts created.
On-topic: It's probably not worth very much. Account names that are worth something would be low character length (1, 2, maybe 3 letter names), short one-word names, famous names, etc.