If you're asking about the crime rate, you can check out http://www.neighborhoodscout.com/nj/crime/
for comparisons of various neighborhoods.
If you're asking about the feel of the neighborhood - is it quiet or not, friendly or not - then I would suggest you spend some time in Plainfield. Shop in the shops, visit the local events, eat in the restaurants. You'll soon get a great idea if the community suits your lifestyle! Good luck!