Watch the Meeseeks episode again.
It's a great show, but definitely not or everyone. Fans of classic sci-fi and horror will probably enjoy it a lot more then the rest (almost all of the season 1 stories base their main plot around spoofing a book or a movie, occasionally some relatively obscure ones).
I agree with the first episode being strongly weaker than the rest, I usually introduce it to people with "Lawnmower Dog".