Gilbert is a lovely area and has different neighborhoods. I would follow the advice of Candice in regards of the research on crimes per area. There is many upscale neighborhoods and some older ones in the northern part. I would also advice to check your sex offender registry here http://www.azdps.gov/Services/Sex_Offender/
Neighbors are also a great source.
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We moved to Gilbert because it is a great area to raise a family. My son went through the entire school system here and he recently finished high school. I will be happy to talk to you about the schools and neighborhoods in Gilbert and the adjacent areas. Just call me at 480-612-4958.
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You'll find all the statistics there to help you compare that to other areas. It's interesting, but it's actually gone done.
Please feel free to contact me via my website, http://www.candicevicha.com, if there's anything else I can do for you!