Jones captained Wales for a record 29th time as Rob Howley's side looked to get their autumn campaign back on track following the loss to Argentina.
But the home team were outplayed by Samoa throughout and Jones said: "I'm not really sure where to start.
"We came second best in quite a few facets of that game. It slowly slipped away from us and we didn't have enough in the end. Similar faults to last week - we played rugby in the wrong areas."
It was Wales' fifth successive defeat and Jones added on BBC2 Wales: "When you come off the back of some disappointing results things tend to snowball, but we have to draw a line under that.
"As players we have to take it on the chin because we have two of the best teams in the world coming next (New Zealand and Australia).
"There is no hiding place. We have front up and make sure we turn up in a week's time.
"What could have been one of the greatest days in my career has turned into one of the lowest."
Speaking about facing world champions New Zealand next, Rhys Priestland added: "It's going to be tough, the hardest game in world rugby.
"The boys are going to have to dig deep and really look hard in the mirror because the last two performances have not been good enough. We have been well short in everything."
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