"Joseph Gordon Levitt, Adam Lambert, Tim Minchin, Matt Bellamy, Jared Leto, Donald Glover, Jim Parsons, Lee Pace, or even Amanda Palmer would be much more interesting choices…."
And you know for a fact that all...or even any...of the above folks are both free and interested in and the right actor/singer for this role? As much as the next person, I enjoy making suggestions about who I'd like to see replace in a given show, but it's not like a given producer can simply decide who he/she wants, snap their fingers and get them. And in a role like this, following a sold-out, Tony-winning run like NPH's, I'd say it's even more daunting to find a "name" actor of any stature who is willing to replace. I hope they keep several of the names you list above in the mix for subsequent replacements, but I don't think Rannells is a bad choice at all and quite honestly, to me, anyone who takes on Hedwig is "interesting" -- it's such a unique role and anyone who plays it brings something different to it. "Good" remains to be proven, but I definitely think it's interesting and I'm encouraged by their willingness to go with proven talent and not just box office clout.
"No matter how much you want the part, never let 'em see you sweat." -- Old Dry Idea commercial