Bernier and Reimer are both fantastic right now; I think it's meaningless to try to go so far as to figure who is the best goalie in the league, but they're both certainly elite right now.
Gunnarsson is a quiet player who plays against the top lines and has the unenviable job of pairing with Phaneuf. That isn't to say that Phaneuf is bad and needs Gunnarsson to pick up the slack, I just mean that Dion has a more dynamic game and jumps into the rush, likes to pinch, and takes slapshots from the point that can occasionally bounce off a knee and turn into an odd-man rush coming the other way. Ain't an easy job, his, and I think he's been doing it well this season.
Ranger looks a little lost out there most nights, I'll give you. I'd probably give him an easier time if he didn't take so many dumb penalties. Mistakes are going to happen, and I'm willing to give him a little more time to ease off on the giveaways, but the dumb penalties.. ugh.
I'm still confident that Gardiner has it in him. He needs time to mature. I know it sounds like he's one of the more likely players to leave the team this year, but I think it would be a mistake to let him go.