* Keeping everyone working on a complex project updated on progress
* Keeping everyone 'aligned' - (horrible corporate word but) essentially all working together effectively towards the same goals (be they short or long term)
* Providing a forum for catching and discussing issues as they arise
* A degree of project management - essentially, making sure that people are doing as they said they would
* Information sharing (note I prefer to cancel meetings if this is the only regular purpose)
* Some form of shared decision-making (depending on the model you have for this) and thus shared ownership
If a meeting 'owner' is sensitive to not wasting people's time and regularly shortens or cancels meetings, it can be done well, I believe.