Justin just hit 27 HRs and put up an OPS of 818 at the ripe old age of 25 in his first year with a new club. He put up absolutely monster months in April and August.
He also played much worse defense than I expected, pretty much stopped stealing bases, had a terrible May/June, and only a mediocre July/September.
Is he maddeningly streaky with a long swing that he never adjusts during an AB, even with 2 strikes? Yes. If that weren't the case the DBacks would have never traded him.
However, I think it should be very apparent why folks think he can be a strong MVP candidate in the future if he ever gains some consistency. He is the one player most likely to carry this team for weeks at a time, which he has already done.