Well I wouldn't want to damn the whole breed, and we have had some that have been incredibly laid back. I have no personal experience of loopy Bazadaises. (Whereas I can tell stories about Charolais and Limousin stirks...) However I do hear about some Bazadaise bulls that give rise to rather 'sensitive' calves - ie, they react badly to noise, sticks, etc. Maybe we shouldn't blame them for that, but when you can be working with breeds that will pretty much placidly go wherever you point them, why give ourselves the grief of ones that will charge around risking injury to themselves and the humans around them?
I think with any continental non-dairy breed it is wise to make sure you have seen the animal out of its comfort zone - easy if you buy them at the auction - watch the vendor with them in the ring, you'll soon see how quiet or otherwise they are!
And even with an Angus or Hereford cross, unless you are buying them from the dairy farmer and he/she tells you it's from a dairy cow, you don't know what breed(s) are in the mix from the mother's side.