I don't think much of this coffee.It's like water.

think much of 对什么评价高
think little of 对什么评价低

固定词组

对...评价不高,/不是很喜欢

think much of重视, 尊重

这里的意思是: 我觉得这杯咖啡不行/不好!

think of 考虑, 关心, 想起, 想象. 两个是不一样的词组

“think much of……” 是“对什么评价高”
“I don't think much of this coffee.”是“我觉得这咖啡不好”
“think of ”是“考虑, 关心, 想起, 想象”的意思。