I rewatched it a few months ago. I enjoyed it again, it's not mind blowing TV but it has interesting concepts, fun characters, and some good plots through all the seasons.
I liked it on my first watch and I liked it on my second watch.
Michael Emerson is great, he IS Finch to me.
Watch it, have fun, enjoy the quirky stuff and if you hate an episode, skip it and move on. There are enough episodes to keep the story going.