I too love the improved AI, and the fact that I now sometimes have to turn tail and run when the fight gets too hot, or I bite more than I can chew. Like it was already said, the previous NPCs were sitting ducks and absolutely no challenge at all. Now it is way better.
On the other hand, I think that the (much) increased amount of interdictions is a little exaggerated (its like half the universe are now pirates) and just does not seem "natural", breaking the immersion, especially on the major factions "home systems". The major factions capital systems are by far the most dangerous for the faction pledgers, and that just seems weird.
I would prefer less frequent interdictions (like before 1.3) but more dangerous (like they are now).