It's difficult - I have had nothing but good experiences of our doctors online system since it came in, and have always gotten a call back and appropriate input.
I will caveat that with the fact that I've not had to discuss anything particularly complex, it's just been a case of getting appointments booked or anti-biotic prescriptions etc and it is great that they will accept photos for some things now and prescribe from those if they can.
Often with the old call system, if you didn't call until after 9, you were just told to call back the next day.
There have been a couple of MH related issues for various family members and they have been dealt with quickly with return phone calls and same day appointments.
I also like the fact that we seem to get referred to an appropriate professional which is not always the GP. I often think the nurse practitioners are much better as a first point of call for a lot of things than a GP and I often prefer to see an NP even if they then have to consult with the GP for prescriptions or meds.
Pharmacy First service is great as well and I wish they would expand it further - since it has been introduced, I've found the pharmacists a lot more helpful than GPs have been previously for similar conditions.
I can understand that for more complex issues it might not be right - however, our GP is constantly refining the online system, so I think they will keep iterating it based on feedback so that it gets better.