讲究 can be both a verb ('to be particular about') and an adjective ('exquisite; refined'). As a verb: 他很讲究吃. As an adjective: 装修很讲究.
culture
Chinese culture places great value on 讲究 in food, tea, hospitality, and even how gifts are wrapped. Being 讲究 is generally seen as a positive quality — it shows care and refinement.