Winchester bullets are junk and the pic proves it. Not only would I not use them , I will not hunt with anyone who does.
Quality Control at its finest
I do not know what caused such a strong opinion on your behalf, but winchesters have done me fine in the past, and will in the future.
I would like to know a little more about the bullet pictured.
If recovered from game it probably did its job, no?
My first thought is maybe the wrong "type" of bullet was chosen, rather than mfg.