I always hoped that this would be one of those shows that got cancelled too early (preferably halfway through season 3 at the latest), so we could all have fond memories of it. But it went on too long, and became mediocre. Sometimes fans are the worst.
It is a bit too cartoonish (and occasionally even annoying with its meta stuff) for my taste at times, but its endearing cast (Brie is just too much cuteness to handle sometimes, as annoyed as I am often with such characters like Annie) as well as (sometimes childishly) good heart at is what kept me coming back. It does lose its steam towards the end unfortunately, especially after Glover's departure.
Good lighthearted fun, great to see Dan Harmon start saying fuck it and doing whatever the hell he wanted after the first couple seasons. I enjoyed it all the way through but some of the fat could have definitely been burned off in the middle and end.