People who say this course is a waste of time have no business flying multi crew.
CRM and working within an airline crew is a very difficult challenge having just flown 250-1500 hours single crew. The process of getting you to work effectively within that crew is a very long one, and starts with ATPL studies and never really ends.
The MCC is just one step along that way. It isn't a case of there's your MCC, now you're multi crew, it is the foundation that will continue through your type rating, and then at every LPC and OPC, and 6-12 monthly classroom discussions on top of that.
It is in no way a type specific course, but I'd go for a full motion sim if available as it is good to have some exposure to these before doing a type rating, but the quality of the training is more important than the quality of the sim, and the aircraft type is irrelevant.