A "complete" Montessori homeschool curriculum contains everything you need to do the job, as opposed to just links to more "stuff" and mind-numbing Montessori jargon. Specifically, you should be looking for a curriculum that provides:
1. Uncomplicated lesson plans (rewritten in everyday language, not Montessori jargon),
2. Scripted presentation instructions (all overtired homeschoolers deserve this level of ease),
3. A complete set of Montessori-aligned manipulatives (as opposed to links to more stuff to buy),
4. Simplified Montessori scope and sequences (again, let's lose the Montessori-speak and put things in terms us homeschoolers understand and relate to),
5. Streamlined, efficient record keeping (a check-list style approach is easiest and best allows you to meet state requirements),
6 Ongoing community,
and
7. Ongoing support (this should come from the curriculum creator themselves).
JUST LIKE MULTISORI.
