This is my experience: forget the numbers and just twiddle with abandon - and I get close, but it still isn't nearly as much fun as my old PCM-42 or my TC Electronics D-TWO. As to multitaps - why should I have to? In other words, a simple, single-tap delay line in this day and age, in this incredible box, SHOULD be able to accomplish these nuances. Additionall, of course, we have the spillover issue, which sucks, plain and simple. It is odd that the box seems weakest at regular delay and looper - the two fx I like most! As to using the FX loop - well, I've got a PCM-70 in my fx loop, and I need some patches with delay before that, and some with it after - which means more than one fx loop (which would be a great idea). Additionally, some of us are just old and rancid and we don't want to carry big racks anymore. If the Axe-FX's Delay and Looper function was better, with more 'real' spilover, and if it could just copy my PCM-70's flanged multiap delay sound, I'd only need it and my Matrix in the rack and nothing else!I think the feedback and mix tapers are just different than what you're used to. For example, don't be scared if you need to set a control to 75% to make it sound like a Boss pedal does at 50%.
Other than that, I can't really think of any reason why it wouldn't "sound good". Assuming you have drive, EQ, and modulation turned off then the delay is just outputting an exact copy of the input delayed by some amount and multiplied by some level. Feedback multiplies the output by some constant and adds it back to the input.
It is pretty straightforward. There's no reason you shouldn't be able to make it sound identical to other digital delays once you understand how the controls work.