Well, we don't NEED them. However, I do think most people simply misunderstand how they should be using critic reviews. Stop caring about composite percentages on sites like Rotten Tomatoes. Find just a few critics that you feel have similar tastes to yours and just read THEIR reviews. Ignore all the others. At the same time, I would put zero stock in "general audience" opinion.
As for the show, my fiancee and I are liking it (5 episodes in). Some of it was a bit confusing at the start, but overall very enjoyable.