The West Indies coach lamented the way his side batted in the second ODI on Friday which he described as "the most disappointing day" for his side in their ongoing series with the world champions.
West Indies slumped to a 63-run defeat under the Duckworth-Lewis Method in a rain-affected match at the Queen's Park Stadium, and handed Australia a 2-0 lead in the five-match series.
Chasing 204 from 41 overs, after the target was revised following a stoppage for rain, West Indies limped to 140 for eight on a pitch that was difficult for batting with Shivnarine Chanderpaul leading the way with 46 not out.
"Our overall batting effort was a poor effort, and I'd say that to the guys," Dyson said.
"It's hard to pin-point what has happened. I thought we did some good things. We bowled very well and fielded very well.
"It's just a shame that we batted poorly. You've seen at times through the series the sort of cricket we can play.
"It's just a shame that we are not consistently playing that type of cricket. That's one of the problems playing against a team like Australia, and also having a squad that is still improving."
West Indies restricted Australia to 213 for five from their allocation of 50 overs after the visitors chose to bat, but the home team's batsmen were guilty of poor shot-selection.
"Holding them to 213, I thought was a good effort, and I expected that with sensible and basic batting, we'd score 214," Dyson said.
"I watched our guys in the nets and they seemed quite free. In the middle, at times it has been shot-selection. You can't go to the nets one day and hit the ball 100 miles, and the next day..."
The last two ODIs of the series will be contested on July 4 and 6 at Warner Park in the St. Kitts capital of Basseterre.