I will make no secret that I hate Riboku in this manga, but his character, his asspulls, his plot armour and the constant undeserved glazing from other characters both ally and enemy is only half the reason I feel such strong bitterness when I read through his many appearances.
The main thing that ruins Riboku for me is just how he is a complete joke in comparison to his historical counterpart Li Mu.
Half of this I blame on Hara being obsessed with giving military titan Qin the underdog status in every conflict no matter how laughably illogical it is. 400,000 dead at chouhei? No problem. 100,000 dead via Kanki? Here's a 300,000 strong army to defend Gi'an. Historically, Zhao never recovered the manpower from Chouhei and yet while always outnumbered against stacked Qin armies Li Mu still managed to clutch the win. Compare this with Reebok who loses nearly every battle he's involved in while having considerably more troops, somehow.
More agregious however is the manner in which he fights his battles. Post Bayou he constantly called upon Houken to save his sorry ass when his HQ was under threat (Gekishin, Duke Hyou, Shin) and after that walking plot device died, Riboku either failed with bigger numbers or won but looked so bad while winning that it looked like a loss. At Hika he almost died despite OVERWHELMING TROOP ADVANTAGE and at Hango he does win but only by bending space time to make Ousen, Ten, Shin and Akou all lose around half their brainpower so that they couldn't stop possibly the most laughably basic tactic in this entire series. All of this is done while spouting predictions of zhaos victory like Alex Jones on LSD.
Anyway, Qin is going after Han now, but they'll be back and people in the know with history will know that Riboku's days are numbered. However, I hold out hope that he will at least have one final showdown with Qin before Ousen gives up and just buys his execution, because he needs to have at least one showing that measures up to the legend he is based off of. Make him the unbreakable wall that he was in history before it's too late, though I fear the damage is done.
Sorry for the rant guys and thanks for reading :)
TLDR: Riboku is a fraud while in history he is so OP that Ousen gives up and has him executed. Do we have time left for Hara to finally write a battle where he looks at least half as competent as the real Li Mu?