So, I completely disagree with mail-mi's use of his power those first three nights--obviously Night 2, but also the other two.
That said, it really helped. For one thing, he was an IC, because it was impossible to fake that story. For another, even though I think shraeye as a bad Night 1 choice, it end up mostly clearing him.
That was a big deal toward the end there, because shraeye was making me rally uneasy. Essentially, his reads were TOO good. Like, I was really worried he knew who the scum were because he was himself scum. The fact that mail-mi pretty much obsoleted that worry made it much easier to trust him on that second to last day. It also made it so that he was never going to be mislynched at the end basically--he was a pseudo IC along with me and mail-mi--so that Axxle basically had to kill him (also owing to the doc thing).
If mail-mi hadn't basially cleared shraeye, I think Axxle might have been best served taking the risk of the doctoring and just plain killing mail-mi, and then played on my fears that shraeye was all-knowing scum.
Instead, Axxle had no choice basically but to kill shraeye and hope for a screw up by mail-mi and Scott.