The Ireland and Argentina sides of 10 and 18 years ago are hardly comparable to these days.
Argentina were formidable back then, now I'd rather a test series against them in Argentina than a test in Edinburgh.
This is the kind of comment you hear from folks who have little comprehension about how countries lift themselves for the RWC.
Here we are right in the middle of a trough between RWC's.
Argentina and Aussie, yes even the Boks and also Wales, Scotland and Fiji. All of those teams can be average in between RWC's, however, when crunch time comes they all have the ability to regularly produce performances that punch above their average results inbetween RWC's.
England and Ireland are both waxing in strength and dominance right now, but in 2 years time, it will be a different story.
England could be awesome, but they have been a mixed bag at RWC's. Always competitive (2015 aside) sometimes the bridesmaid, but they have to be taken seriously.
Ireland on the other hand seem to fall on their sword at RWC time. They have flattered to deceive and all this banter, which is to be fair, generated by the good results they have been garnering, will be tantamount to tumbleweeds if they give their usual historical offering at the RWC.