I thought this too and wasn't even going to consider geese, but my husband remarked that they were good watch critters and would alarm at stuff. (They do!)
I raised an African gander and a Toulouse goose, and both are incredibly silly creatures. Not a mean bone in their bodies. Sure, they posture and bluff, but the one time my husband said they were "scary big," I went over and picked up the gander and he went all silly and squawky. My husband laughed.
I have two more geese--Chinese browns-- that are very sweet and hang out with the ducks. The African and Toulouse (EEqua and Louise) are too big to hang out with the other birds, but they're very good with each other and with me. My complaint about geese is more how messy they are than meanness!
I think the wild ones--like Canadian geese-- might be a bit "meaner," but given the rough nature of the wild, I wouldn't be surprised.