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"Good" can be quite subjective. There's a few objective measures that incorporate jitter, depending on what you're doing but no real definition of "good" jitter on its own. For VOIP calls for example jitter is factored into the overall MOS score, for gaming it depends on the game - in some games 10ms is noticeable in some 1000ms is perfectly fine.
Personally I find anything over 2ms is indicative of a questionable service but then on e.g. 3G MBB 10ms is perfectly normal.