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General Grievous is an uninspired, worthless character.
He's so much cooler in Legends than the new canon. In Legends he spent time as a champion gladiator, was a warlord on his own planet, and was then systematically stripped of his flesh in favor of cybernetic enhancements while Dooku trained him. Unfortunately in the new canon, he's basically been reduced to a mustache twirling killbot that is comically, constantly escaping capture.
I think the biggest issue with Grievous stems from a few lines in the films. Anakin's quip, "I thought you'd be taller" in ROTS extremely limited what they could do with him in the show. As seen in several episodes, they really had to strain belief to avoid having Anakin and Grievous meet throughout the entirety of the Clone Wars.