READ: I highly recommend that you don't watch the preview. It's not the worst we've had... but it's a tension killer nonetheless. Skip to 22:05 if you want to see the Tsunade skit.
Naruto Shippuuden: Ep 137 SD | HD
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I'm very pleased with that this episode was filled with moves worthy of a top-class ninja battle. All the moves were discretely used and thought out, reflecting Zetsu's words that techniques really are just tools, and that its mastery, placement and timing is what counts.
That rigged shuriken was genius, but what was more shocking (personally) was that Itachi normally could somehow dodge that in thin air with no footholds.
Battles where chakra capacity is limited are so much better to watch. It puts emphasis on that every move counts, as well as avoiding mindless clone/rasengan spammage.