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They are definitely not always hypoallergenic. That's a huge myth perpetuated by the back yard breeders who keep pumping out these guys. Hopefully the obsession with doodles will die down soon because it is getting out of hand.  Probably the worst that I have seen is a MalinoisxPoodle. Ethical breeders aren't selling good quality dogs to people so that they can cross them with Poodles, so the poor things are already starting with one strike against them. 
A 'kennel' near me boasts that they have between 30 and 100 puppies available every week.  That's mind boggling.
i don't know what triggered the labradoodle wave, they're everywhere. Personally, never liked dogs that looked like a teddy bear. >

Dog trainer here. Back when the first doodles were breed, they were amazing dogs. You knew what you got back than, they’re energy was mild, not very big in size and most doodles breed were from pure breed dog and another pure breed dog. But now they have been over breed to the point that you get the looks you want but the personality…it’s like using a randomizer. It’s sad to say I train and work with more doodles than anything. They are everywhere. But the problem is the whole pet dog world shifted from function with dogs to fashion and looks. People loved how the curly hair looked and how cute the faces are but total disregard the personality traits they’re gonna get. I hear it all the time “our neighbors have an amazing calm golden doodle so we went and got one, but ours is very high energy and way to rough with play and not what we expected from the breed” and don’t get me started on when people say “I have a pure breed mini golden doodle” like no you do not, you have a mute, sorry any dog that isn’t from pure lines and is a cross breed is technically a mutt. So you own a mutt. I just don’t like doodles because they over breeding and the standards of the breed went way down over the last 10 or so years 
Also had no time to check for spelling or grammar, walking out my door to ironically work with a Bernadoodle…lol >

That makes a lot of sense, and I appreciate the insight. The curly hair is definitely an aesthetic/fashion choice that people seem to like, but it's not my taste at all. 
P.s. I'm currently trying to rein in a 9 month old bermadoodle  my husband and I are boarding for the weekend. She's a whole bag of nuts lol >

Oh good Bernadoodle’s are the worst of the doodles. Yeah I’m not a fan either because 9 times outta 10 people get them for looks but don’t think about anything else Fun fact that people don’t know is before we used labs and other bird hunting dog breeds we have now. The poodle was the original hunting/bird dog. They have a high prey drive and are naturally high energy and are often used in duck hunts. So when you cross a Bernese Mountain dog and a poodle, you get a 50-90lb Tasmanian devil. Because bernese Mountain dogs are a  high energy large working breed so when you cross the two you get some crazy dogs. I have yet to meet a chill calm bernadoodle. >

As another person that loves dogs I feel the same way. Maybe not quite so strongly but I've notice doodles tend to be more hyper and prone to misbehavior. Or maybe the type of people who prefer them just dont train them well, either way I don't really like them much either. I dont find them cute and I really feel a limited desire to interact with them at all which is very contrary to my (borderline unhinged) love of dogs. >

I think it’s the training rather than the dog, people buy them thinking they will be an easy family dog, and then don’t give them enough attention. >

I definitely think training is a major factor. It breaks my heart when owners don't take the time to properly train, exercise and teach their dogs