According to the memos, and according to all source in the know, and even some source not in the know, yes, there was only three people tortured.
Further, clearly, since we were able to foil a plot to fly a plane into a build in LA, it did save lives. The only way you can claim otherwise, is to make the assumption that we could have discovered the information without waterboarding. Which if that's a valid theory, then so is the idea we could have waterboarded the 93 bombers and prevented 9/11.
Torture did not go way beyond waterboarding, unless you are referring to torture happening outside US control. Which if you want to discuss that... fine, but none of this applies. Why? Because Obama expanded rendition. More detained people will be turned over to foreign authorities, and will be tortured. In short, Obama's actions will increase the number of tortured people, not decrease.
Moreover, there is a clear cause and effect between the waterboarding of Al Qaeda personnel, and terror attacks. The information led not only to the foiling of the LA plane attack, but also lead to specific information about the whereabouts of key Al Qaeda operatives. I've documented this before. If require, I'll repost all the same information again.