The idea of calm, logical, and telepathic Spock as a Jedi is not such a strange image. At the root of the comparison lies a very fine point that is, in Star Trek, explored only briefly in a few minutes of screen time and the occasional Vulcan centered novel:

The difference between suppression of emotion, and mastery of emotion.

The Jedi Order of the prequel trilogy is focused upon the suppression of desire, fear, rage, hate, and passion; however, rare is the one who can live with suppressing these emotions.

We can draw a parallel from this to many more real examples. Suppressed passion, secret passion, emotion firmly hidden from one's friends, relatives, and co-workers, burns all the more violently. Forbidden fruit is all the sweeter; forbidden rage smolders more hotly.

Nobody was surprised when Anakin fell to the dark side; the Jedi Order firmly forced its members to renounce all passion. Contrasted with this is another path: Mastery of emotion.

Feel, but do not deny your emotions; master yourself in spite of your emotions, and you can master your own emotions. Perhaps this is what Luke did in the throne room; perhaps this is what Yoda meant when he sadly referred to the mistakes of the Jedi in the final movie of the saga.

It's certainly more appealing. Jedi characters who feel their emotions, but when necessary, master them in order to do what they know is right, seem better people than those who shut out - or try, but fail, to shut out - all passion.