"He stinks" is just a little bizarre when the kid has a 1.000+ OPS at the moment. I could get that people don't trust him to hold it -- heck, I don't. But come on, this "stinker" has carried the team to a certain extent, and played a big role in propelling them back to .500 territory.
An OF, even a corner OF, who can get on base consistently can start on many of the bottom 15 teams in MLB.
Lest we forget, ZIPS saw this coming. I got shouted down pretty good when I brought up in the preseason that one of the ZIPS projections predicted Nava could pull in a ~.750 OPS. It doesn't mean much now, except to suggest some level of sustainability. Frankly, I think that's a pretty good split-the-difference point for him, and if that OPS is weighted to the OBP side of the equation a guy like Nava can win a job.
He's not a bench player. He's not replacement level. He's already proven that to my satisfaction. From what I've seen, he's a David Dejesus. A below average journeyman caliber starting MLB corner outfielder. He has the talent to hit .290+ in the big leagues and get on base well enough to be worth a shot at the top of someone's order. And if that's all it is that may well be enough.