It’s brilliant but you do need to know what you’re doing.
I feel like that's only a little more true for OpenWRT than it is for stock proprietary firmware. You need a bit of competence to get it installed, but once you're using it LuCI is more-or-less just as easy to use for normal, basic tasks. It can do other fancy stuff that stock firmwares can't do at all, but that shouldn't count against it since you don't have to do those advanced things.