Well, considering most dialog in ME is painfully limited, with Shepard only having two optional behaviours - to be a verbal moralist or an amoral bully -, I don't see how we can expect any improvement in that department in the next installment.
However, the devs should definitely work on this. Is ME a mere futuristic shooter or true scifi? Because one of the many qualities that define scifi is to show concepts about technology and society that are intelectually challenging while presenting a credible extrapolation of the overall structure of future civilizations.
In many ways, ME evolved to become less like scifi and more like a futuristic cowboy adventure, with its cheap dialog, predictable plot, stereotypical characters and Hollywood like effects. Omega felt like Blade Runner, the Citadel felt like some kind of UN, Krogan were Klingons, Salarians were Vulcans, Liara was the nice, but boring girl, Miranda was the sexy chick, Tali was another nice girl and Shepard himself could be replaced by any American hero, like Bruce Willis or Jason Statham that the player wouldn't even notice.
So yeah, Bioware can avoid this kind of mistake with Andromeda. I hope they do. They learned a lot with the ME trilogy. Now it's time to put this experience to use.