I’ve truthfully never heard of ESB criticized because of Vader. I think it’s just Vader freaking out in the most Vader way he can. He knows his Force sensitive son is out there, so he wants the best of the best in his Empire. Anyone underperforming to his standards is subject to harsh consequences.
Whenever the Jedi were wiped out, he must had lost a sense of purpose. But with Luke brought to the forefront, it’s like he’s forced out of temporary retirement. Imagine what he must look like in front of his peers. Basically a fool because some kid blew up their most powerful weapon. So of course he’s more angry sounding and tougher.