The best comparison to this card is Quality Time.
Quality Time lets you draw 5 cards. Customized Secretary lets you look at the top 5 cards of your stack and install them later for a click, which is quite similar drawing those cards.
Except, of course, Customized Secretary is restricted to programs. In exchange for getting only programs from the top 5 cards of your stack, and taking up a point of MU, Customized Secretary costs 1 credit less than Quality Time. This comparison is very unfavorable for Customized Secretary.
It's very rare for a Netrunner deck to be more than 40% programs. If a Customized Secretary deck is less than 60% programs, you're going to get less than 60% * 5 = 3 cards on average, which makes Customized Secretary comparable to a Diesel which costs 2 more and takes up a point of MU.
If you want to go into deep theoretical situations, I'm sure there are situations where Customized Secretary is better than Quality Time or Diesel. Maybe a Runner deck which also has London Library and Aesop's Pawnshop, or if a Runner deck really needs more card draw after maxing out on Quality Time / Diesel, or against a Corp deck running Student Loans. However, in typical cases, I expect Shaper's event-based card draw to be much better.