GOTG: They bare no resemblance to the original team (admittedly alternate dimension ...but, not just at first, only after young Astrovik was created.) That origin was in Marvel Super Heroes (number 18 I think Gene Colan art) and then the original series. Then there was the 90s series which was pretty good and mostly the same team with Star Hawk-Aleta and a few others added. I remember a young woman, who I thought kicked ass.Alternate Universe we were told.
Now it is all descendents of Starlin books mixed with Marvel 2000s cosmic characters. Rocket Racoon was first in Hulk. Starlord (although, vastly different) had his own, one-shot, B&W mag. Wasn't Groot a Marvel big-Foot Monster (period)? Or was he a Hulk villain too? Gamora from Warlock. Drax, although mutated and smart now, from Captain Marvel. Moondragons' daddy, brought back to life by Kronos with brain damage and one though. Kill Thanos.
Really thought Cosmo, Moondragon and Mantis (the Celestial Madonna, after all) were vital to the new group but, guess they wanted to simplify for the movie. Which will be made too complex in the second movie, as happens, by complaints about the first. They live on a space station that is really the dead corpse of a Celestial. It is a big, rough place, with nasty inhabitants, and they are the defacto sherriffs, as well as Guarding our Galaxy.
Tied into Nova Corps, Kree, Skrull, Shi'ar, Magus' Universal Church of Truth, Warlock, Marv-ell, Inhumans, Thanos, Infinity Gauntlet, Cosmic Cube (Tesseract for all you movie goers), Eternals of Titan, Terrax, Quasar, Badoon, Negative Zone, Cosmic Control Rod, Moondragon, Pip The Troll etc... type of stuff.