After reading this thread, not only did I laugh at how mad can people become over Manga discussions, and greet my teeth at how annoying can fanboys be. I can understand many of the reasons the person creating this thread had to do so, and I also kindly request him to read my opinion.
I've seen you have all assumed that Minato's Hiraishin is a teleporting technique. I agree to that much remembering when he removed the explosive tags from Naruto as a baby and then warped to somewhere else where he had a kunai. But right now I have something in mind that rises many questions. Would there be any difference between the time Minato warps between A and B USING A KUNAI, and the time Minato warps between A and B USING A MARK?
My point is, when he uses Kunai we have seen that he moves through Space and Time, but as for the mark... Is it really moving through space and time? If it is, then why was he called the Yellow Flash? Once you teleport yourself, there's nothing to see. No light, no nothing. You're there one moment and gone the next. But in Kakashi Gaiden, which is the first moment we see Minato using a mark, he doesn't seem to move through space and time... People could notice, albeit barely, that he had MOVED (not warped) very fast, and the only thing that could be seen was his blonde hair, hence his nickname. Makes sense?
So, yeah. Minato IS fast. Not only because of his reflexes, and his reactions, but also simply because he MOVES fast.