The problem with Knack is that it appeared on the surface to be a new 3D platformer, which is very clearly ended up not being. As pointed out, it's more like an e-rated GoW.
the 2nd game fixes this exponentially and leans more into platforming, but it's also feels like a much longer game than it needed to be.
That said, I enjoyed both, but the real deal killer for Knack was its poor art style, and I honestly believe that it was hurt its chances.