Conversation so far:
When was Led Zeppelin IV released?
8 November 1971
How successful was  Led Zeppelin IV?
In the US Led Zeppelin IV was Led Zeppelin's best-selling album
How did Zeppelin IV do after it's first week?
Led Zeppelin IV entered the UK chart at No. 10, rising to No.1 the following week and has spent a total of 90 weeks on the chart
How were the reviews for Zeppelin IV?
the fourth Zeppelin album (Led Zeppelin IV) would be the most durable seller in their catalogue and the most impressive critical and commercial success of their career“
Where there any bad reviews for Zeppelin IV?
Led Zeppelin IV was first issued on CD, but Page criticised the lack of quality control, saying first-generation master tapes were not used and there was excessive tape hiss.

Question: What did some of the positive reviews say?
Self-contained rewrite: What did some of the positive reviews about Zeppelin IV say?