The value of not being tied to a sweetspot is dependant on your room and how you listen and frankly is not the least bit important if you buy what you need for your listening space. i listen in a chair in the middle of my room - the chair is on rollers because it is a computer chair and my computer is in the room. When I am on the computer and listening to music I am well over to the right(looking at the speakers). To me tonality and timbral accuracy is more important.

That said it can be nice to have good off axis response which is why I can listen to my system against the right wall the left wall center and I get very similar nearly identical results with my main system -- my second system does well for a horn set-up in that it sounds similar off axis but I don't think it gets the center image bang on even in the sweetspot. My main system does an incredible job on acoustic music because whether you are in front of a piano or beside it t should still create the sound of a piano in a believable way -- or any other instrument. Besides the system should be conveying the differences between recordings -- system one does it one helluva lot better than system two and every other system i have ever heard - which is why it is system one.

It simply comes down to, as boring as it may be, listening and finding something you like -- if you need techno-babble and to read graphs it probably meant the system didn't engage you on it's own merit -- and if it didn't do that then you made a mistake IMO.