Do you think that Goldfinger was extremely evil?

Evil enough...? He was willing to sacrifice lives and the security and stability of whole nations just to enlarge his personal gold's value. That level of greed and selfishness is evil for sure. His childish temper when he is forced to stop cheating and lose at cards causes him to kill his "girlfriend". He murders for pleasure and profit. Yeah, I'd say he's evil.

"Extremely" sort of depends on your definition. That almost implies "irrationally" evil. Like, The Joker in most Batman incarnations is extremely evil because he doesn't even have logic to justify anything. He is cruel and twisted for its own sake, as an ethos. Goldfinger is motivated by greed, which is understandable insofar as you can see how he got there (while disapproving and condemning of every action he performs and result he achieves). He also doesn't go out of his way to be awful to people. He's an immature, bratty, selfish, greedy, narcissistic, obsessive, tyrannical monster, but not irrationally, if that makes sense. Extremely is in the eye of the beholder?

Yes. Sure, there are evil-er people out there, both film villains and real life monsters. In terms of sheer fucking awfulness, Goldfinger cant compare to the likes of Ramsey Bolton or the average dictator.

But Goldfinger had such style and panache, that he's a memorable and enjoyable screen villain anyway. And he had an outstanding theme song... "GoldFINGah!!"! You know you love it...

Who do you think was the evilest Bond villain of them all?

I'm not 100% sure, but, in the running...

Elliot Carver was willing to perpetuate wars to keep print media alive.
Ernst Stavro Blofeld's sheer scope of villainy puts him in the running.
Rosa Klebb's is filled with utter sadism and a love of inflicting harm and pain.
Frank Sanchez exploits people, worships greed and gain, tortures, kills, and maims. (Dario, Sanchez's henchman, is pretty awful, too).

He was going to cut a guy in half with a laser, starting with his balls. That's evil.