we need to take a step back and see what's there right now: did we expect Argentina to come ina and actually beat the Top 1 2 3 teams in the world their first or second year ?
It seems like we're implying inclusion alone should guarantee instant results and wins. Like, if you put Japan in the RC they won't just by default win in the next 2 or 3 years because, well, they're Japan and the others have a couple of RWC trophies each. Things don't magically happen.
And it doesn't matter that they lose by 60 in Joburg or get 50 put on them at home in the last match, they are testament to a horrible inconsistency on their part but that's all. France lost against everyone when they first entered the Home Nations, obviously, what did you expect, first ***le 4 years into it and then Grand Slam their 7th year ?
Same for Italy 13 seasons ago in the 5/6N, and again the same for the Argies in TRC.
This isn't like the South American Cup where Argentina send a 4th string team that puts 100 on everyone, every year, for the past 50 years or wtvr. Those other sides have no hope of improving, in fact Uruguay made the RWC once and never looked to return since. Those South American nations don't care about Rugby, don't have the means or capital to really build - while Argentina is a Tier 1 nation that finished 3rd in the RWC some years ago, have a reputation (in the scrum for e.g.) and world class players. They're hungry, and their intentions are real, they're not just hanging in there playing the tournament as a formality.
They are really looking to improve, their fans are complaining...etc..
Not to mention last year's run was an total success, and this year did include a not-too-bad result in NZ, a 1-point loss away in Aussieland, and coming substantially close at home against the no.2 side Boks.