To me, TPM doesn't deserve to be called "best" anything. That's really lowering the bar. "Least terrible" perhaps, but IMO calling it "best" (and I'm not picking on you, Tiptup, many here have done this) is like being given a list of diseases, and choosing the "best" one to get.
It only seems better because of the two other films it's compared to. Again, just my opinion.