Judge Sotomayor's Lack of Competence

NR has a series of Bench Memos posts which make me wonder whether Judge Sotomayor may not be worse than mediocre in her intelligence and education. See here for example, which quotes her saying that Spanish has no adjectives, and giving an example in which she misspells a Spanish word. There are other examples of that kind of thing in her speeches. Her legal opinions are better, I suppose, but that suggests she relies heavily on clerks to fix up her writing.