Only two seasons? Obviously not simple enough for most viewers. And not enough plot cliches. I watched every episode of the two seasons and never felt cheated or regarded as too dumb to follow the story. However, if you're looking for science-fiction, this is not it. The parallel worlds element is kept in the background. These episodes were character driven and shined with excellent acting and great scripts -- a lot about relationships, who we think we are, and how others see us. I have always been a J.K. Simmons fan, but I've never seen him so good. And the rest of the cast deserve equal praise for what they delivered. Yes, it could get a little confusing at times, but nobody I know nodded off through any of it.
