system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40K] How would have Mankind's Men of Iron have compared to the Necrons in battle?
gpt
Depends on the type of Necrons. 

Based on what we've seen of surviving Men of Iron, their primary advantage was ease of production, durability and numbers. They weren't particularly intelligent, and can in fact be out preformed by Guard. Their basic weapons systems also didn't seem particularly impressive.

Generally, they would probably rate between Warriors and Immortals, though it's hard to determine without more comprehensive information on the Men of Iron.