I agree. There was a time when Brendan Fraser was being referred to as the new Indiana Jones due to the Mummy movies. I thought those movies were good fun. They weren't Indiana Jones and I don't think the directors were going for that. The point is that there's no reason why we need to have "Indiana Jones and the..." in the title at all. Find an actor, put him in some adventure clothes, and make a movie about him going on an adventure.

The Mummy, National Treasure, and several others have done it just fine. It doesn't need to be part of a franchise in order to be successful, it just needs to be good.