Can’t believe people are mentioning the 2011 squad. In those conditions at that time, it was inferior to India only.
That squad would have been better with Malik, Butt and Amir playing instead of Younis, Shehzad and Akhtar which obviously didn’t happen due to multiple reasons, but it was still a very good squad.
The 2015 World Cup squad was comfortably the worst, but it was pretty much the best squad we would could have assembled at that time.
2011 had the worst batting line up out of all the Pakistan WC sides, with only Umar Akmal having a reasonable tournament (Misbah's stats are misleading). 2015 at least had Haris, Sarfraz and a slightly improved Misbah (from his awful Mohali knock) to give Pakistan a little bit more batting prowess. Pakistan's spin trio steered Pakistan towards the latter stages of the tournament in Asia but two of these had illegal actions (Hafeez and Ajmal).
Imagine if Ajmal and Hafeez were able to play in Aus/NZ tournament then I think we would have beaten WI and ended up higher up the table during the group stage, facing Sri Lanka instead in the QF with the possibility of another semi final appearance.
Having said all that there are various ways to analyse this:
1. Quality of the team in respect of that era
2. How the team fares with the rest of the competition
3. How good is the side at the conditions of the host country(s)
4. Quality of batting
1 - Pakistan's 2015 side was playing the most outdated cricket than any other Pakistan WC side.
2 - In 2011 the quality of competition was very low, there wasn't many decent spinners or more importantly batsmen who could play spin bowling well in that tournament. Yes Pakistan was the only side inferior to India in those conditions, but that doesn't give a fair representation when the standard of the teams in that tournament (barring India) were very mediocre. From the 92 WC up until 2015, 2011 was certainly the lowest in standard. Australia's team was in transition and was short on quality particularly after the retirements of Hayden, Gilchrist and Mcgrath. Pakistan's team missed Butt, Amir, Asif and Mohammad Yousuf.
In 2015, the quality of the competition was a lot higher. Australia had improved with the likes of an established Warner, Starc and an in form Maxwell. South Africa had ABD at the form of his life and New Zealand's team was far superior with the form of McCullum, Southee, Guptill and addition of Boult to take them to the final.
3. Pakistan's 2015 may look worse than 2011 because they were playing in alien conditions as opposed to Asia. One could argue with the weaker pace attack and batsmen (very woeful against pace) of the the 2011 team they may have struggled to get out of the group stage, after all 2015 the team was in strife against Zimbabwe of all teams!
4. ODIs generally and even more so recently has been dominated with the bat and since the 2011 had the weakest batting line up of any WC Pakistan side, this only reinforces the case for this side having the unfortunate label of Pakistan's worst WC team.