I looked at a QROPS for my government pension (AFPS 75) but the adviser (to be fair to him) told me I would be mad to transfer it due to the inflation linked guarantees on it. I took fee based advice which was well worth it as you say as the commissions on the QROPS can be up to 7% so at least the adviser was not conflicted.
Sure, if investments do well you might do ok from a transfer but with a government tax-payer backed scheme (depends of course which country you come from) you have certainty with a defined benefit and that's worth a lot. Also, with the QROPS your money can run out.....