Set Realistic Expectations for AutoSummarize
The Problem:
I needed to produce a summary of my thesis quickly, so I used the Tools 
AutoSummarize commandand got complete drivel. Correctly spelled drivel, mind you, but the text seemed to be chosen at random.
The Solution:
Well, what did you expect? AutoSummarize has no idea what your document is about. It doesn't understand the contents. All it does is count the relative frequency of nouns, verbs, and so on and decide which are the most "important" based on frequency. Your chances of getting a usable summary for your thesis using AutoSummarize are negligible.
This suggests AutoSummarize is uselessbut that's not entirely so. Say someone dumps a hundred-page report on you 10 minutes before the meeting at which you're supposed to elaborate on itand the report is completely unformatted, so you can't skim through it and read the headings. You might try siccing AutoSummarize on the report and seeing what it produces. It doesn't take long, and you have nothing to lose.