The issue of CPF was a popular one during elections season raised by many of the opposition parties, especially given how thorny the issue is.
Indeed, the CPF system is a painful one. As a fresh graduate earning on $2,500 not too long ago, it was depressing to only get slightly more than $1,800 each month for living expenses. (If you're thinking that should be $2,000 instead, you're right - I actually suspect now that the accounts were incorrect, but back then I wasn't financially savvy enough to flag out my employer for it. Oh well.)
So what were the different opposition parties saying about the CPF? I won't go into detail here, but if you're interested, here's a really skeptical breakdown provided by MoneySmart that I like.
With the exception of the Workers' Party, I personally think that the rest of the opposition parties got it wrong......