Absolutely. It's like film reviews. Critics have panned movies that I have actually enjoyed and conversely praised movies that I thought were rubbish.
Yes, you can get some guidance reading cruise reviews, but frankly I've found that most reviews are written by people who wanted to have a good rant and complain about everything. Unfortunately, most people who have a good time, don't bother to leap into print to say so. Honestly, I've read reviews from people who were on the same ship and at the same time as us and couldn't believe the negative comments. Their experience certainly wasn't ours.