I've removed the parts about ranking mirrors and removing the reflector line because I consider them wrong. The order of the mirrors in the mirrorlist is irrelevant in the metalink and the previous line implied the contrary/
As for the part about reflector retrieving slow servers, the minimum download speed can be set to avoid using them even when they're in the list. I do not recommend uncommenting the "Reflect" line though because most users will not have 45 uncommented mirrors in their mirrorlist and when using the minimum speed option, the user will most likely not notice any difference at all.
Of course the user could use stand-alone reflector with different options to retrieve the 45 fastest mirrors and append them to their mirrorlist, then remove the "Reflect" line in /etc/powerpill.conf.