It depends on what sort less than perfect training? A staffy needs a strong hand, but doesn't need to know how to sit,stay,roll over etc to make it a good dog.
It is however a startlingly intelligent breed, very eager to please, and can easily be trained to be agressive. But then, again the same could be said for a lab. They too are very intelligent, so could be trained to be aggressive, with relative ease I imagine.
A Staffy would do good with a strong owner, even with no formal training. Without a strong owner, but with one who has no intention to train agression, you will end up with a very, very bouncy, licky, energetic and willfull dog, but, not a vicous one.
The only lab we have ever had was very submissive, so I don't know if they require such strong owners.
She too is a rubbish retriever. Despite being from purebred, champion gun stock. If she heard a gun, she would probably piss herself. And when I throw her ball, she gives me this look that says "Seriously, you want me to chase that??? ALL the way over there??? No thanks" and then curls up at my feet.