As always, YMMV. I've actually tried using 0 and can't go back to it. Sometimes after a calibration reset I forget to set it back to 2 and it's painfully obvious when I start watching content.
I've been surprised by this, as I hate any kind of artifice. Of course there are always some differences between sets, so what may look good in some may not in others. I guess that's why they put those controls there
. For all I know your 0 may look like my +2, or sharper