Exactly, think in Mushu (Mulan), we all hate him when he broke the stone dragon but at the end, he achieved to help Mulan. Coincidence? I do not think so.
I saw Marsh first!! He is mine!! (Adolin too )
I'd be quite boring if you don't get any surprise, Do you like flat characters? People without personal growing or evolution at all? Because this is what you are asking for a character that until now only had make a few really really bad choises.
He felt regret when he saw Kaladin when he kill to Elkohrar, he missed bridge4's crew, he help to the pashmendi, he does't have a wicked core, he is simply quite lost, his thirst for revenge blinded his good judgment.
Szeth was the bad boy in the first book, but now he surprised us and we are hoping him to joing Dalinar.
When I read I like to feel like a rollercoaster with surprises and unexpected twists of plot, If Moash finish like Odium's champion and the Kaladin's antagonist, It would be so predictible and boring.