"A toddler who doesn't have tantrums probably has major problems and probably isn't being brought up properly. Children too scared to express views before their parents because otherwise they'll get thumped or be emotionally withdrawn from might appear good but in my book they're behaviour is not appropriate".
Xenia you make some good points but I have to disagree on the begining of your point above. Yes maybe in some circumstances this is true, but not always. I've always thought that to a certain degree the 'terrible twos' are a bit of a myth and a self-fulfilling prophecy, parents expect it and talk about it long before their child is two. Then the child has a tantrum once, hey presto it gets a reward and so is reinforced, and the cycle starts. It's all about behaviour patterns.
DS had only one mild tantrum at 2, it got no attention whatsoever, and he didn't bother doing it again. I know this is a lot to do with his temprament and character and nothing to do with him being scared to express his views, he just didn't throw tantrums at two, but was silently defiant instead... and believe me he is being brought up 'properly' in a loving supportive home.
At 3 he does now have tantrums if he can't get his own way, 3 year olds have a greater sense of themselves as individuals than 2 year olds (and they aren't really toddlers by 3 are they), so perhaps too many parents bring on tantrums early in toddlers by expecting them and so unconsciously reinforcing them as acceptable behaviour?
Ultimately though children's behaviour has as much to do with their individual characteristics and personality as with any particular parenting style, as siblings and twins demonstrate so well!