A paragon Shepard could've easily chose to ignore the council and focus on sovereign
I'm not sure what you mean here. My argument is that, in that scenario, and throughout ME1, it is humanity being portrayed as entirely competent and getting the job done. The above supports that assessment and is still in keeping with the idea of ME1 constantly emphasizing how it's only a matter of time before we obtain a Council seat through our own awesome abilities, while everyone around us stagnates.
ME1 isn't about the Volus and when they're going to get the first Volus Spectre. Or about humanity's regression as a species as other people take control. Or about us struggling to eek out an existence in the galaxy. ME1 in an overarching sense is about humanity's rise to power. Think Hero's Journey on both a personal level for Shepard and on a species-level. By the game's end, we've either equaled or surpassed every other species, at an unprecedented pace. Saying ME2 and 3 are guilty of being human-focused is absurd in the face of the narrative ME1 set out to establish.
It wasn't the only reason he joined the reaper he'd also thought submission was preferable to excitation, they also did take him as a serious threat since he's working with the geth.
Well, until they point out that Saren is on the run for his life and denied all Council resources, qualifying a single human ship to be capable of stopping him.
The main antagonist in ME1 wasn't a threat to one species but the whole galaxy, ME2/3 the antagonist were more focused on one particular species than the whole galaxy.
Note the contradiction here. Saren is portrayed as a threat to humanity throughout most of ME1, but you regard the threat as galactic level. The Collectors/Reapers focused on humanity, but apparently they're not a threat to the whole galaxy? Did they suddenly stop declaring the genocide on the other races when we weren't looking?