Personally I think Guardians is a pretty well-written show. And while there is some synergy with the live-action movie, the show has touched on some stuff that hasn't happened in the Marvel Cinematic Universe (and in some cases, might never happen). We had J'Son back in the 1st Season in what was probably the show's best arc, we had Thor as a guest-star alongside Angela, and now we're getting Mantis as a villainess and Adam Warlock.
I think that's doing the show a disservice.
I mean, obviously the show has taken a lot of visual and characterization cues from the movies, but I think to it's credit it's also brought in plenty from the comics that were not in the movies and been able to establish itself as it's own entity separate from the films. We're certainly not going to get something like the Adam Warlock scene in today's episode in the movies anytime soon.
Yes, they've taken a number of things from the comics. However, the things that they've taken from the comics have been changed and altered to fit into the GOTG MCU continuity (like the High Evolutionary being an alien). A lot of the stories are written with future movies in mind (like Mantis being a bad guy). That to me, hampers the creativity of the show. And we all know that they will either ignore or change the shows past continuity and stories in order to make the show more similar to the movie continuity. Heck, I'm calling it right now, either this season or the 3rd season (if this show is lucky enough to get a 3rd season) they will do a story where it is revealed that J'son Quill is actually the humanoid construct form of Ego the Living Planet. This type of restricted synergy is one of the reasons why the current Marvel shows are so creatively bankrupt and lackluster in regards to the writing (with the exception of several episodes). The writers of these shows have their hands tied by synergy.