I watched Inglorious Basterds a few days ago. I really enjoyed it, especially after Tarantino's let down that was the second Kill Bill film. The action was good, the story was good.
I had one problem with it though. It felt like some of the characters really went to waste. Certain ones were expounded upon well (the German officer who had that lengthy scene at the beginning in which you get to know his character); but others were left in the dust.
One good dialogue scene between the Basterds would have made the film for me. There were opportunities for great characters (the Bear Jew, Wilhelm Wicki, Raine) but none of them ever really came to fruition. Hans Landa and Mimieux were handled well and developed, but the Basterds were never fully characterized. One scene dedicated just to them (showing them in conversation with each other or somehow interacting) would have really boosted my appreciation for and interest in their characters.
As I said, I enjoyed the film; but as it stands, I found it slightly lacking.