Frankenstein is a victim of his hybris, he´s not evil per se and definitely not a villain. He did not really think things through when he created the creature. but got carried away by the excitement of the possibilities. When the "creature" became self-aware and began to feel alone among the humans, an outcast, Frankenstein was surprised by its wish of having a mate. Frankenstein was like a parent who was unfit to handle his child, a motif that we later saw in a lot of other scifi or fantasy movies like Species....
Except in the source material, Dr. Frankenstein is the villain, and the creature is a tragic victim. Even Young Frankenstein understood that.