splintering weapons are pure PvP weapons, which determines the prefered mods on them:
hci, dci, hld, hla, hit spell, regens of all sorts for example would be good.
The above weapon has leeches and drains only which don't really work in PvP. Furthermore the above weapon is brittle which will lower its value somewhat because splintering will wear them out in no time. You want them to be clean (as in not brittle).
Another thing to look for would be clean splintering weapons that can be imbued.