[Blarg]

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a good kick to the knees or gut is often more effective than a nutpunch.

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It's also often much harder to land, and land squarely, and puts you in a much more dangerous position when you try.

But for what it's worth, as to effectiveness, it's quite possible to keep fighting after a crack in the nuts.

Another note -- I'd probably be more likely to try to grab a guy's nuts and squeeze them than punch them. I've wound up with a guy's nuts in my hands quite a few times during sparring. It's a pretty natural way to go after a punch in the stomach, if you've sidestepped and gotten close, or spun around to get behind him. You don't need any wind-up or timing, and the nuts are just hanging there waiting to make your acquaintance.