That’s the whole point of the character.
Well considering he is the main villain, that is bad.
“I want a badass villain who’s a master of the force and lightsaber combat, but who is not like Vader in any regard, because that would be a rip off.”
Yeah. And despite his patheticness he is still very dangerous.
To star destroyer control computers and such?
well, that is obviously not a joke, so it must be a question.
The answer is no. humans are not dangerous to computers. force sensitive or not. Exhibit A: R2D2 and C3P0.
JEDIT: also this↓