There is nothing to be disappointed about, most of the teams perform poorly on foreign pitches. Even then, it must be admitted that Sri Lanka, as an experienced team, did worse than expected. It is a real shame for the Sri Lankan team that the Sri Lankan team lost the match by a big margin against New Zealand. In my opinion, the Sri Lankan team players should have played with a lot of awareness. If the Sri Lankan team players could have played a conscious game, then maybe the Sri Lankan team would not have been defeated by such a margin.
New Zealand has been performing very well in this ODI season, winning two consecutive matches which shows that the New Zealand team is stronger. These two matches have been won by the largest margin, but most of the time the New Zealand team has been aggressive. There are enough reasons why Sri Lanka lost this match, only one of the top batsmen of Sri Lanka, Kamindi Mendis, has performed well but the rest of the players have scored very poor runs.
However, the bowling has not been able to create pressure, and the pitch condition is deplorable due to rain, which has made the Sri Lanka team batting panicky.