These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Opinions are mixed regarding Diane Kruger's character having Asperger's. A related debate has ensued over whether the writers should be more explicit about this in the show.
Marco Ruiz's affair with Charlotte Millwright came across as Out of Character for some viewers, at least at first. Though it is very strongly implied that it's not the first time he's cheated, either on Alma or his first wife.
Villain Sue: Fans have raised objections to David Tate's seeming omnipotence, believing it to reach its nadir when he somehow shows up at exactly the right place and time to Car Fu Sonya and Gus. And then there's the fact that his plan involves things he has no way of knowing or controlling, such as Marco having an affair and Alma throwing him out for it.