As far as the Hero Factory series goes, the only voice acting I take issue with are Surge's and Breez's, they're just irritating. The rest I honestly enjoy.
The story is kinda flimsy, and misses a lot of potential it builds up, but it's entertaining enough, and by no means does it need to be more grimdark. That's just silly.
Fight choreography, on the other hand, could stand to have a lot of improvement. It's pretty mediocre, to be honest.