canofhumdingers said:
Hmm... I guess officially I'd have to say during the Coruscant speeder chase sequence in AOTC. It was the first time in my life I was downright BORED while watching an action scene in a Star Wars movie. I remember watching it in disbelief, looking at my watch thinking "What's wrong here? This is Star Wars, I shouldn't be so bored!" Then the love scenes & asteroid chase sealed the verdict.

Though prior to that, repeat viewings of TPM had given rise to stronger & stronger worries that this was going to blow.

You must see Attack of the Phantom. Speeder scene way cut down. Love scenes made believable, No Asteroid Chase. It flows so much better.