MPTS does not make it easier to do poorly and get through.
MPTS is not easier than the old system. It is just different. The reason there are training jackets with mutiple unsats is because an unsat is NOT a down. Downs don't exist any more.
MPTS is just as efficient at removing a student for unsatisfactory performance as the old system. The problem is when IPs apply their old system experience to the MPTS rules. For example, not awarding an unsat unless it meets the old "down" criteria. When that occurs, then it is hard to attrite a student. But that's not because MPTS is easier. It is because the IP didn't apply the correct criteria when evaluating performance.
So, did the above happen? Unfortunately, too often, and that was a problem. As the instructional culture changed and the understanding of MPTS has grown, then things got much better very fast.
So, if you are at an FRS looking at a training record of a newly winged aviator, before you assume the guy is cat fish (bottom feeder) because he has more unsats than you had downs, make a call to one of the TWs operating under MPTS and get a little education.