Within my schooling experience the Tyler Rationale seems to be a part of the main evaluation systems in place. Everything that was taught felt like it was being taught for the sole purpose of examination, and to find out who could regurgitate the most information from class. Most of my classes only focussed on an outcome-based system. At the time that the Tyler Rationale was established schools were trying to emulate the conditions of a factory line, where you start with one thing and mold and shape it until it comes out the other side a prepared member of society ready to contribute. Now, obviously schools operate differently in the day to day processes, but I believe that the same goal of just giving what needs to be given and sending out a person to contribute to society is still implied by many school systems.
I believe the main disadvantage to the Tyler Rationale is the amount of stress put on the outcome-based approach that focusses on heavy evaluation to determine success. in my opinion this is the largest drawback because it does not take into account that there are some students who ca not handle stress of examinations, or are just bad test takers. There could also be some kind of outside problems going on with the students in their family lives. Many kids that I knew growing up had a lot of issues in their families and it was reflected in the work they did the next day at school.
But, one of the advantages to the Tyler Rationale is the organization. For the sake of the teacher the level of structure and organization would be nice. In my case I did better when things had a set structure within the classroom, and many people I know like myself, tended to thrive in an organized and well structured learning environment. But it all comes down to the type of learner each student is, because not everyone will do well in certain classroom environments. The most important thing in modern schools now is that each student is going to get the best education they possibly can and that their needs are met by the staff. Hopefully schools will continue this upward trend and become better than they have been.