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I'm not sure that would actually help. Assume a person guesses a 1-10 number, and there would realistically have to be a fudge factor to account for personal tastes, a bot could guess "7" and be correct enough of the time. A fairly large solution space would be needed for an effective captcha.

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Just show 10 pics, nine over 8 and one under 3. Not only fast, but pleasant to the eye.

If you just used pictures of 1s and 10s then it should work reasonably. Of course, the bot would then be right 50% of the time, so you'd need to include, say, ten pictures to rate to get the false positive rate down to one in 1024.

This is, of course, starting to look like more trouble for the user than it's worth.

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