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Kanto: The only Victory Road I still legitimately get lost in. It's my favorite for that reason alone, and because I spent 3 days in there once.
Johto: Simply awful, it was a third as long as it needed to be.
Hoenn: Pretty mediocre. If I remember correctly it's the only one that requires Flash to get through, which is stupid.
Sinnoh: Pretty average too, but at least you could get through it without too much use of HMs.
Unova1: Pretty great opening gate, and fun to go through. If it was more challenging to get through it'd beat out Kanto for sure.
Unova2: some of the best environment design in a pokemon game so far. Too bad it was really dull everywhere else.