An unhappy baby doesn't mean bad parents!
As a mom of two VERY happy babies... and one VERY not happy baby, I have to say your baby's happiness doesn't reflect your skill as parents. While I think babies can't be super super happy without good parents, they can most certainly be super unhappy and still have great parents. Babies have a lot going on in their little worlds, and no matter how much we want to, sometimes we can't figure out what's wrong and why they are upset. That doesn't make us bad parents, it makes us normal.