I find people don't like calls if they don't have an opportunity to prepare for them well. A call that has a clear agenda, a clear purpose, a set of well defined outcomes, and (ideally) a document sent ahead of time for people to read and think about makes calls significantly more effective. Otherwise everyone just says they'll think about stuff and then you need a second call to get people's reactions.

Sometimes setting everything out in a document and an agenda can even make the actual call redundant, if people respond with their input early enough.