The worst thing is a panicked corner. Negative feedback in the corner is often times more about the ego of the corner than about helping a fighter. I don't think reminding a guy how hard he worked helps but reminding him where he came from and where is trying to go can work.

I think you have to let a fighter recover, physically, do something that helps emotionally (it may be something subtle like a confident demeanor or a positive statement (you're too fast for him, he just isn't as gritty as you are (it's got to be true, don't make it up)), and give him something to go on tactically (which will also help his confidence). I think there are a lot of over rated corners out there and that, conversely, I have seen some less acclaimed corners do very well.

You guys are right though, a lot depends on the kind of fighter you are dealing with.