As a guy that has followed the Wolves pretty closely, I can say:
1) The TWolves would never trade Muhammed for Evan Turner, and their fans and front office would probably scoff at the offer. Muhammed is viewed as their sixth man, and possible starting SF, of the future. He is a back up only because the Wolves have Kevin Martin on the team. If Martin is traded or injured, the consensus is that they will start Wiggins at SG and Muhammed at SF. (Wiggins played minutes at the 2 last year. Zach Lavine is viewed as a future two-guard, not PG, in an ideal world.) He was also a lottery pick, and his recent improvement gives Saunders no reason to drop his value.
2) Muhammed is improving. He's like the Wolves' offensive version of Avery Bradley. His uptick in 3-pt percentage last year (I believe over 36%) was a huge development in a guy that mostly relied on left-block post ups to score the previous year. He's entering that "make or break" third year where he basically plateaus or keeps improving, and almost everyone is high on him.
3) Some (emphasis on "some") people are comparing him to Jimmy Butler (as his counting stats are similar to Butler right before he broke out).
4) Defense is not exactly his strongest skill, although the Wolves as a team were pretty horrid on that end.