Dude, if you want to complain about the form of England team, then it is OK. But on what basis are you claiming that the Ashes is an overrated series? I can't think about a test series that is more famous than the Ashes. All the others, including the Border-Gavaskar and the Trans-Tasman comes behind Ashes in terms of popularity and viewership. Ashes is something special. It is the oldest rivalry, existing ever since test cricket was played for the first time. There may be a few occasions where the competition was not up to the mark. But that doesn't give you an opportunity to blame the series.
Silverwood and Joe on SL tour after winning : Our Ashes preparation are going as planned.
Silverwood and Joe on India tour after humiliation : We need to up our game standard for the Ashes.
Silverwood and Joe in middle of NZ and Ind series : We are playing world no 1 and no2 and we couldn't ask for better preparation for the ashes.
That's how English treated every series. You never hear Aussie talking like this even when they play Bangladesh. Ashes is cash cow only because of "Oldest Rivalry" .
No one care about Trans-Tasman series, even in NZ. I suggest you should re-check your BGT's revenue, viewership figure and avoid making baseless claim.