Pakistan started the World Cup against the Netherlands and Sri Lanka. These two teams are the weakest in this World Cup. Even then, Pakistan did not get an easy win against these two teams. Both the matches were very competitive.
After that, Pakistan lost all four matches in a row. If the performance of the bowlers had been better then maybe we would have seen 2 more wins from Pakistan. But the performance of Pakistani bowlers is quite weak in this World Cup. And finally, the team finished the World Cup journey from fifth place in the points table.
Talking particularly of the Pakistan journey in this World Cup, yes they were just disappointed with their forms. Even their wins against the small teams were not by a big margin due to which they struggled in the run rate too. Apart from fakhar zaman one performance in the match against New Zealand where he scored 126 runs, i can't remember any significant performance from their batting lineup. Even in that match, had it not been interrupted by rain, Pakistan may not have chased 400+.
Also, there is nothing special to talk about their bowlers too. We know that over the past World Cups, Pakistan had some great bowlers but in this World Cup they had an ordinary bowling attack. Shaheen Shah Afridi, their trump card, did not look comfortable at the start of this bowling spell and went for too many runs, putting pressure on the other bowlers.