I have watched 22 of Harrison Ford's movies(I saw him in Apocalypse Now, but that role was to small for me to include) - This is how I rank them from my favorite to my least favorite. As with my Robert DeNiro list , Ford doesn't have many clunkers, and there is actually only one of his movies that I rated under a five. I watched a lot of his movies this month and found some that I had been under rating - most notably What Lies Beneath and Indiana Jones and The last Crusade - he is with out a doubt one of my all time favorite actors. The order of this list is subject to change a I watch more Harrison Ford movies or if my opinion goes up or down in future viewings.
Of the ones here I've seen they're more or less in this order. Blade Runner might be a bit higher up depending on my mood. Only one not here (cameos aside of course) that I've seen is Hollywood Homicide, which I would have to re-watch to recommend or not.