I guess I don't know what you mean by "nuts." Do you mean difficult to train? Energetic? Aggressive?
It would seem to me to be a silly thing to assume that all Labs are any of those things. They are the breed of choice for Canine Companions for Independence, Guide Dogs for the Blind, and many SAR/bomb/drug sniffing programs.
I have never met a Lab I would consider "nuts." Labs are the breed that made me fall in love with dogs. Growing up, my dad's best friend and his wife always had two black Labs. They were gentle and friendly and fun and they had soulful eyes. They never tired of playing fetch, but they were well-trained and gave up the game when asked. They were tolerant of children, other dogs, cats, and small critters. John and Katie used to bring them to church, leaving them tied under a tree during the actual service. On more than one occaision I actually left Sunday school on the pretext of going to the bathroom and never returned, preferring to sit with them under the tree, instead.
Katie and John still have two dogs, although they are now yellow. One is a purebred Lab, the other a Lab/Golden mix. The Lab is a facility dog. The mix is a hearing assistance dog. In the manner of most service animals, they are almost eerily well-behaved.
Having said all that, they are not the ideal first family dog that so many people think they are. It's hard to find a well-bred Lab and ones that aren't well bred may have serious behavior issues inherent to the genetics. They are easily trained and eager to please, but they are full of energy and really do need a job like those listed above. Without some sort of task to perform, they need excessive amounts of training and exercise to be happy, balanced animals.
I have found Goldens and Labs to have very similar temperaments, but I'm sure diehard fans of either breed will disagree with me.
ETA: I obviously have two Lab mixes myself. They are both very strange, but I don't think their strangeness has anything to do with them having Lab blood. Alvin is uninterested and detached with strangers, perhaps as a result of being on the streets or perhaps having to do with being part Shar Pei. Clifford has some anxiety issues I attribute to primarily to his severe disabilities (lameness and deafness), but which may also come from having been abandoned and spending way too long in a shelter.