I think average-pu players just need to be more involved in general. And it needs to take less than 3 hours to play 3 maps. (establish captains immediately after the end of the map, even if picking won't commence for another 10 mins, more admins with server control, etc).
Captaining to win is fine, so long as the people are somewhat close in level at assessing skill.
And people should be given some leeway in who they pick. For example, I've been picked relatively late (in my humble personal opinion

), but as a result, I've also won 25 matches in a row. Unsurprisingly, captains with winning records (like Fire) pick quite differently from the average (won't name names, heh). Probably could have phrased this better but the point is some "outrageous pick" in one person's mind based on limited data could (not often) be a "better pick" in someone else's and usually is for winning captains.
If they aren't at similar picking levels, or it looks stacked to other would-be captains, they need to step up and at least mention it. If the captain still thinks he can do it, he should get his shot, but realize if he gets smashed, he isn't captaining for a while, and he needs to re-evaluate how he measures people's skill.
I'm not advocating strict rules, but rather, community involvement and a certain degree of leeway combined with common sense (and being told what the common sense is).