I think, and this is just my opinion, that there were within the Church as well as outside individuals and groups, all of whom had specific agendas to pursue, that used the documents of the Council in order to further their own agendas. Add to that the fact that shortly after Vatican II ended the encyclical Humanae Vitae was issued to what can best be described as thunderous disapproval by these same special interest groups and individuals. The faithful were told by religious of all ranks that they were free to disobey this encyclical as what it referred to was simply a matter of conscience. More than a few still believe that and it is still being spread.
The majority of the laity of the time period, raised to obey Church Officials, followed the lead of these special imterest groups and individuals, mostly professed religious, and pursued their own agendas as well, often having little or no understanding or even knowledge of what was actually in the documents.
Add to that the fact that experimentation was allowed, even encouraged in the Liturgy, and you can easily see the groundwork that led to what followed.
It became very easy to either blame Vatican II or praise it, depending on your own beliefs. Lets take for instance the use of Latin. Nowhere in the documents does it state that Latin was to be replaced by the vernacular. Nowhere. Yet because it did say that use of the vernacular may be of some use in** some **occasions,Latin was almost completely wiped out of liturgical functions.
Why? Answer, special interests. The anti Latin crowd. Nothing more and nothing less.
The same can be said pretty much of every abuse and perceived abuse that came about. Whichever group was promoting whatever new practice, would call upon the documents of Vatican II to back them up. And in a great many circumstances it worked.
And so, it became very easy for those not enamored with wholescale change to blame Vatican II itself for all of these things.
A very sad situation, which hopefully will improve as people become more knowedgeable about the Council itself and the documents that came out of it.