None of the players in our group uses their advantage to inflicts critical hits anymore. A few did it initially, but the effects were not only underwhelming but also introduced additional bookkeeping duties for the GM which slowed down the pace of the action and were often forgotten.
In our groups' opinion many of the critical hits on the critical table are only relevant for the PCs, who might be bothered by them for several encounters. Nobody really cares if the difficulty of all Presence and Willpower checks of some rival is made harder in the few brief rounds he has to live, etc.
Also, we found that non-combat optimized characters rarely score critical hits. because if they do hit, they rarely generate enough additional advantage. Conversely, if the combat-optimized characters often inflict so much damage that a critical hit becomes superflous: the target is already dead from damage most of the time. Players much prefer to use their advantage to give a boost die to someone else or doing something cool with their advantage. Note that none of our players are optimized for crits. I can imagine if you manage to get a real high bonus to criticals, it might get interesting to use vs. Nemeses.
Are you experiences similar? Do criticals get used often or not in your group?
I'm wondering because so much rules are devoted to criticals, and the handbook even says its the primary use of advantage for combat checks.....

