I think it varies from day to day, and deer to deer. I have had them charge in, run away, and everything in between. I believe that there are deer that are fighters, and those that are lovers, and I base this on watching little bucks chasing off much bigger bucks from time to time. Just yesterday I watched an aggressive forkhorn chase off a pretty nice 4x4.
I have a buck decoy, and does seem to not like it at all, but bucks become interested in it, walking in in their dominant pose, but losing interest pretty fast when the decoy doesn't respond.
My experience with calling is that it works sometimes, but nothing is certain, and it may or may not do the trick. Evidently, nobody told the deer that they are supposed to charge in every time like they do on tv shows.
Your mileage may vary.