MCPHS grad chiming in here.
Yeah, this is true. They accept D as passing grade and I've seen the trend of people being gone before spring semester of P1 year and more gone by P2 year. I can attest to this because I was one of those people gone by P2 year (struggled with pharmacotherapy and gone by the end of Fall semester of P2 year). The school does allow you to repeat the failed class the following year (which is what I did). With that being said, the teaching style of the school is more hands-off and independent study, which means that if you don't make an effort to read the chapters or add to your own study notes (in addition to class notes; this is less true for P1 year and more true for P2 year), then it's really easy to fall behind. My advise to current students is to work with each other (study groups, quiz each other, share study notes etc....) or if you prefer to work alone (not advised) then bring an audio recording device (ask for the professor's permission or read their syllabus, I believed most of our professors allowed this and stated it in the syllabus) to record lectures and relisten to it after class (while still fresh in your mind). I know when I attended they had video recordings, but ended up stopping it, so I don't know if that's still happening.
Let me know if you guys have any further questions about MCPHS Worcester and I'd be more than happy to answer. I may be a bit slow in answering since I'm currently studying for the CPJE (CA version of MPJE) which I have in a few days. Thanks!