Yah, Waller was turned into a moustache-twirler for sure. I'm surprised she wasn't filmed tying someone up to an actual train track and laughing manaically, it would have fit right in with her persona in these movies. But I was also disappointed with the Thinker, he was just kind of there and treated the same way with no subtlety at all to him. Polka Dot Man's mom, same way. Just a fat joke.
Ronan in the first GotG movie similarly disappointed me big time. He was made into a literal sledgehammer, basically. The actual comic character is basically a Judge Dredd type but he's pretty complex.
Must just be a Gunn thing. The MCU and DCU both have some complex villains in it, after all. Its not impossible to do that.