Låt mig motverka detta med en annan fråga (och visserligen något spekulativt svar): Vad får dig att tro att Vision inte fick Thor någonsin? I filmen ser vi Vision aktivt Mjölnir, inte bara när han händer det till Thor, använder han också i strid. Så han kan definitivt hantera hammaren och utnyttja sin kraft. Frågan är då, vad du definierar som "Thorens kraft" då (och hur mycket av det är faktiskt relaterat till hammaren direkt eller mer till Thor). Är det blixtarna? Vi ser honom inte använda dem, men han kanske inte har utnyttjat dem de få gånger han höll på hammaren. Är det styrkan och osårbarheten? Vision hade det ändå redan med sin perfekta biomekaniska kroppsform.
Eller är det förmågan att styra över Asgard? Jag skulle säga att Vision är faktiskt värd det också. Som beskrivet i mitt svar på en annan mycket relaterad fråga är Vision faktiskt värt att hammaren och scenerna med honom som bär hammaren en skulle förmedla exakt det:
Vision seems to be the embodiment of the ancient ideal of a perfect mind in a perfect body, one that combines the advantages of a mechanical intelligence with the concerns and soul of an organic lifeform and brings compassion for his (undoubtedly inferior) human fellows, in contrast to his purely mechanical brother Ultron. He thus seems to be the ideal creation of a humanity that strives for posthuman evolution. One could say in his second try Tony Stark (with the help of an actual (demi)god and some magic alien artifacts, though) overcame his role as merely a "Modern Prometheus" and didn't just create sentient life, but a new god in itself.
And the fact that Vision is able to wield Mjölnir to me doesn't come from the fact that he is "just a machine", as Tony and Steve argue jokingly at the end, but from the fact that he is superior to us all not only in his body but even more so in his mind. And this I think is the attitude that Mjölnir is attracted to, as already shown in the first Thor movie and also in this one when Steve nearly achieves to lift it (which was not because he is the strongest, but because he is the noblest at heart). In fact, Tony's and Steve's theories about Vision being "only a machine" at the end even support the interpretation that this is not the case by the mere humorous way they are presented in. Of course their childish excuses are not the reason for why The Vision achieved what they couldn't. In fact his pickung up the hammer is a perfect and to the point illustration of Vision's superiority and immediately clarifies that to the viewers, a symbol that has been explicitly set up by the earlier scene (with the whole gang trying to pick up the hammer) for exactly that purpose.
So yes, Vision does get the power of Mjölnir and Thor with everything connected, including the abstract notion of "being worthy". But what makes Vision so extraordinary as part of his "worthiness" and what makes this worthiness and power seem so trivial (without the nice effects described in the other answer) is that he doesn't strive for this, he doesn't care to rule over Asgard, not because he can't as "a machine" or because he doesn't have a soul, but because his mind and motivations are above such "worldly" considerations. His light-handed and downplayed way to hand over the hammer to Thor and his easy ability to carry it in battle convey both his worthiness and his not caring about this at all. He is a god without a god-complex.
Så jag undrar om det finns något annat som definierar "Thorens kraft" och att Visionen saknat eller visade inte. Det faktum att vi inte ser honom utnyttjar alla Thor's krafter till fullo kan bara bero på att Vision inte behöver använda dem, han har sina egna krafter (som inte är sämre än Thors alls). Att använda Thor eller Mjölnirs krafter över att vara nödvändigt är inte i sin natur , som förklarat.