The Holy Grail was a pretty good movie and hit on a number of cylinders. I agree on Temple of Doom and Crystal Skulls, could have been much better.
Compared to the other two, the Holy Grail was the best of the three, but it was nowhere near the quality of the first. The first was hitting on all cylinders.
Also, just like in the Original Star Wars, Harrison Ford gunned down an adversary in cold blood and without hesitation. In other words, he was sensible.
