If one took a film similar in idea: Alien, then you hopefully see what I mean about the characters needing to be three dimensional. In Alien, a group of humans arrive on a planet only to find that it is home to a life form which wants to wipe them out. Moreover, one of their number is actually planning to bring said life form back to Earth ... and as such Terra Formars plays out in similar fashion, but without the three dimensional characters or the cool monster at its heart.
What I can see in Terra Formars are echoes of a great many films/TV, all of which did this sort of thing much better. There's Alien as mentioned, but also Blade Runner (the opening could almost be from that film), Starship Troopers with the idea of humans trying to wipe bugs from the face of a planet, there's Transformers and Power Rangers in the strange idea that in order for the humans here to succeed, they must be able to change themselves via injections of some mystery DNA potion into hybrid bugs themselves ... thus we have a chap who can blow flames from his mouth, a girl who can extrude silk, another girl who can implant 'herself' into the brains of others to control them, and a chap with giant hornet stings on his hands ... plus many others.
There's a fair bit of misogyny in the film as most of the female characters are summarily beheaded by the roaches without a thought, while the male characters battle on. There's no mourning, just moving on with the action, and while some of the male characters are killed, it all seems a soulless process. All driven by some fashionista back on Earth who has an ulterior motive which, again, I can't recall what it was ...
This is not a great film, and it suffers from a degree of slowness in the earlier stages, and then repetition in the later acts. The characters are instantly generic and forgettable (I didn't come away with the name of a single one of them), and, just as with Power Rangers/Transformers once you have seen the transformation into a hybrid the first time, it starts to drag with each successive time: a collage of the real insect and information about its particular 'powers' against CGI of the film character growing antennae or mantis-arms or whatever.