From Diablo Wiki
"Stat stick" is a term used for items that add only stats, but not any unusual properties. It's generally a term of insult for legendary items that are "glorified rares" and don't change up the gameplay or add any legendary properties beyond bigger numbers. Most of the crafted legendary items in Reaper of Souls are just stat sticks, to the disappointment of many players.
Stat sticks may be quite useful items, of course. Bigger numbers are the way to go most of the time in Diablo 3 and other ARPGs. But the ideal is that legendary items do something more or different or special.
Many legendary and set items in Diablo are more than stat sticks, and these are usually the most-sought items. See the full listing in the Legendary Affixes article.
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