Imho Zidane is in the same category as Luis Enrique. They both "got carried" by their players and I don't care that Zidane won 2 CLs in a row, since the first one was easy as feck and the second one incredible multiple individual performances. All of that coincided with Madrid's key players being in their prime and clicking. Zidane has shown numerous times to be inept and make flabbergasting decisions (as did Enrique). Enrique, on the other hand, got carried by a superior front line. Just my two cents, maybe Madrid's fans know better about Zidane.
There are too many variables in a cup competition to use it(be it World Cup, UCL and etc) as the best measure of greatness. Injuries, luck, avoiding counter teams, referees and no league like match-up system between every team to find out the best one in the long run. It looks nice on paper when you see 2 times in a row UCL wins or 3 in 4 years(that's not a dig at Madrid, it's a great achievement), but when you look scrupulously at the context it is not as great as it may seem on wikipedia. Imagine for a second if Pep's Barcelona met some attacking teams in 2010(I know, I know, you are going to point at Inter home match, but you get the idea) and 2012(Barca basically bottled it or just wasn't lucky enough, I don't know) semifinals of UCL, it may have turned out differently and it could have been 4 in a row, but it wasn't. That's cup competition for you. Therefore I consider league performances as a better measure of greatness. Unfortunately we do not have an international league like tournament where the best 10 teams in Europe from 5 best leagues compete against each other. I have no idea if that is at all feasible but that's a topic for another day.