fair enough, i disagree with some of yours xd
ninjutsu- developed rasengan, ftg, skilled with sealing
taijutsu- he's close combat based, definitely has great speed and reflexes, not shown much but he hasn't gotten hit and managed to snatch kakashi away from that iwa jounin and mark him, and mark tobi the second time, merits a high score
genjutsu- orochimaru and hiruzen have been given a 5 in genjutsu, yet oro got creamed by a simple genjutsu of itachi's. being hokage i think he was at least skilled in breaking genjutsu, so i gave him a 4
speed- self-explanatory
strength- already have an explanation
stamina- his feats vs tobi and the kyuubi imply a high level of stamina, teleporting a tbb, food cart destroyer summon, teleporting the kyuubi, fighting tobi, and sealing half the kyuubi.
handseals- did them quite fast when making that s/t barrier, although probably not as fast as itachi, so i gave him a lower score (lower, incidentally than hiruzen and oro)
a 37 score puts minato basically at current naruto and sasuke level imo, and definitely lower than madara and tobi (probably 39-perfect), which falls right into my ranking of them. prime hiruzen would also be higher than 37 in my book