Consider that in the past we used to just drill the weapons and put a gem there.
Doing this prevents the use of the Appraised stat, until you remove the gem (or destroy it).
I really can't remember an use of appraised stat on those Uniques.
But it seems we have different substats available now, so my whole post can be useless
What I would say about Low lvl Uniques is that those became really wanted at some point, once the market and server will allow to max one of those, you'll have a great way to level new chars.
The Market itself will have dozens of "base" stats Gems, allowing you to equip an unique at lvl 1 or so.