I always put cutlery with the business end up because that was where the muck was. If I put them in with the blades/tines/spoons down, the bits just got swirled about and stuck to another item in the same section of the basket and then, for good measure, got baked on in the drying process.
It never occurred to me to put the blades facing down.
Who leaves a dishwasher open anyway?
Nowadays I have a model with a tray at the top. This is a very bad design.
1. The third level (cutlery tray) doesn't have its own spray arms and the spray from the second level does not reach up properly to clean the cutlery.
2. Due to the third tray taking up space, you lose on height in the other two trays.
I don't like to pre-rinse the dishes because then I may as well wash the lot by hand anyway.