Lack of quality? The level in decathlon is crazy high these days. Needing over 8700 to medal has only happened once before. That time 4th best did score just over 8400.
Yeah, it could have been even better if Skotheim or Warner did not fail their pole vault, if Lepage was not injured, if Mayer was not injured (but even then I didn't expect him to do well), if Ehammer might have participated in decathlon over long jump, if Owens or the Americans actually delivered once in an international tournament, if Scantling did not have a suspension, if Kyle Garland did not injure at USA trials, if Moloney didn't have another injury. If the Estonians would be stronger here.
And even then there are other guys stepping up, like Rooth and Roosen. But the level of competition is crazy high these days. Yeah, the winning score is not crazy high. But that's decathlon for you, they can't deliver every time, there are injuries sometimes, there are moments where even favourites can drop out. There are mistakes to be made. You can't have a perfect run every time.
I think we are in a crazy competitive era of decathlon. Maybe that lead to a bit too high expectations to you, but I did not feel there was lack of quality whatsoever.