If you need laugh tracks to remind you that something is funny, than Kevin is not for you. If you love the mainstream cookie-cutter comedies that are indistinguishable at their core, than Kevin is not for you. If you don't 'get' shows like Snuf Box, Comedy Bang Bang, or Mighty Boosh, than Kevin is not for you (maybe you should stick to the teletubbies).
It's Kevin is smart, quick, and an oasis from the heaps of garbage that executives bulldoze towards the masses. Granted, many people eat that garbage, like rats in a landfill, but I'm can't stand the taste of stale clichés.
I love It's Kevin because it's new and something I've never experienced before. It's slated for only 6 episodes but I don't think the novelty will have worn off after only one season.
There are some bitter people who feel inferior for not understanding this show. Don't let their ratings discourage you from trying it out.