评论家 (pínglùnjiā) is a noun meaning "critic" or "commentator." It refers to a person who professionally evaluates and comments on topics such as art, film, literature, or politics. The suffix 家 indicates a specialist or expert in the field of 评论 (commentary).
这位评论家对那部电影的评价很低。
Zhè wèi pínglùnjiā duì nà bù diànyǐng de píngjià hěn dī.
This critic gave that movie a very low rating.
他是一位著名的文学评论家。
Tā shì yī wèi zhùmíng de wénxué pínglùnjiā.
He is a famous literary critic.
不少评论家认为这幅画是今年最好的作品。
Bù shǎo pínglùnjiā rènwéi zhè fú huà shì jīnnián zuì hǎo de zuòpǐn.
Quite a few critics consider this painting the best work of the year.