Generally, Real Robots in anime shows try to be realistic. Anything you could expect from a Sci-Fi movie. No bizarre weapons or hot-bloodedness, for the most part. It sometimes depends on the actual feel of the show, though.
Some good examples of Real Robots are Gundams (minus G Gundam), Macross mechs, and Fafners.
Look at Super Robot.
Some dude A: G Gundam is one badass real robot.
Some dude B: That's a super robot, you twat!
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