What criteria would you use for judging legal arguments?

The arguments need to be based on actual law, and any cited reference cases need to be real.

There's been a lot of news stories about lawyers using AI, and then getting in trouble for citing hallucinated laws or cases. It doesn't matter if the AI response is "preferred" over the human one if it gets thrown out when put under the scrutiny of a real case.

Who's gonna determine that? A bunch of law professors?

But did they? Or did they just go off what answer felt better? Did they put in any work to actually confirm the answer? Or did the busy law professors just click through and move on with their life?

maybe seeing if the case law it cited was real or imagined? Just one idea, IANAL

Well, they had the data around if the answer would be harmful to the students learning. AI was scored at 3.5% harmful answers and 12% of law professor answers were considered harmful.