NBC broadcasts are terrible, but let's be real about a few things.
First, I don't feel like the overall product is "biased" against Detroit. EdZo is probably not a fan of the Wings, and as a human being, that might shine through from time to time. But if think about the perspective of fans of every other team, players like Datsyuk and (previously) Lidstrom are pretty much universally revered by the hockey media - and even rival announcers/bloggers. Datsyuk can make a routine stick check and they'll still be raving about it after he turns the puck right back over.
NBC's real problem is that they have very recognizable media figures (isn't Emrick a HoF voter?) who either are badly overrated at their jobs, or at the very least, aren't a good match for each other. Edzo offers very little insightful commentary. J.R. (another former Hawk) is personally annoying, but his strategy breakdowns in the intermissions are somewhat insightful, even if it's something like figuring out who screwed up an assignment on defense.
Emrick is so polarizing. The people on my Twitter feed who are big sports fans but casually/disinterested hockey fans LOVE the guy. He definitely has his own style and there are times I like his enthusiasm. But compared with someone like Strader, Emrick's ego just won't allow him to actually CALL the game. He talks over plays with narrative about crap that nobody cares about, which is a real shame when the on-ice action is really good.
Same with Pierre. Guy is creepy, obviously, but he has a huge wealth of hockey knowledge that just doesn't need to be shared in the middle of a play. Paired together with Doc's narrative rants, it really detracts from the game.