I asked this question in the Wisdom of the Crowd:

Which of these ministers do you respect most?

Here are the responses: (35 Votes)
29 % - S Iswaran
23 % - Masagoes Zulkilfli 
17 % - Vivian Balakrishnan
17 % - Lawrence Wong
14 % - K Shanmugam 

See the pie chart at: 
http://www.wisdomofthecrowd.sg/chart.aspx?ID=1032