For people that are experienced long time cruisers we know that 2 people on the same ship can have very different experiences. I have read bad reviews because of the language used by the comedian in the "Adult hour comedy" or that the comedian picked on one group, Weather was bad, bad weather and missed a port so they gave cruise a bad review. We have all read 2 reviews in a row about the same date, same ship, one was "the worst cruise of my life" and the next was "Best cruise ever".
There are all kinds of things that can make a cruise not great to you but awesome for others. I look for reviews that give examples to what the problems were and if the line could correct them.
I had read a review of the 4 night carnival cruise that was horrible. The inside cabin was the size of a closet, the food was not edible, service in MDR was bad, the fellow cruisers were "undesirable" and auto tipping put on the bill with not being told of it. This was from a person that had taken over 7 cruises. When questioned in the forum turns out this cruise was a gift from their kids, they typically cruise Seabourn.
All reviews need to be taken with a grain of salt.
As a long time cruiser I know that cruising is not what it was 20 years ago, but it is better then what it will be in 20 more years. The price of a cruise has not gone up as much as everything else. Think of a gallon of gas or a pound of steak 20 years ago to know.... 4 or 5 times as much, a cruise has not gone up 4 or 5 times.
As I have said before Cruising is not what it used to be but is better then it will become.
I think if a area of the cruise is given a bad rating the reviewer should have to give examples as to why. Same if an area is given 5 stars, give examples why. The reviews that give examples are the ones that I pay more attention to.