Best Robot Movie

Terminator 2, hands down.

T2: Judgement Day (I Really Liked The 1st And 3rd, But I Thought This Was The Best Of The Series)

WALL-E

And if it counts, The Day The Earth Stood Still.

The Terminator and Terminator 2: Judgment Day.

Well, notwithstanding Holden's criticisms, as far as what's actually shown in the film, my fave Robot is easily the Iron Giant.

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It's what you learn after you know it all that counts. - John Wooden
My IMDb page

That's a fantastic movie. Really underrated.