I believe that Packard is our resident metallurgist.
Maybe he'll have an answer.
I have a general faith in manufacturers, that nobody truly wants to make a defective product (except, maybe, the Chinese).
Thus, I am willing to bet that well-designed, well-made MIM parts are the equal of forged-and-machined ones—in the applications for which they have been designed. However, if Taurus uses MIM parts, they are probably not the very best choice.