I love it. The add fights are tough, the boss fights are actually fun, and the mechanics are logical. The Ryelaz and Zilyesset fight has a burn control mechanic, but it doesn't punish a lot of burn like Rockgrove's Flame Herald or stop the burn like Sanity's Edge's Exarchanic Yaseyla. Cavot Agnan requires the group to coordinate, healers to heal a lot, and tanks to pay attention. I think the Orphic Shattered Shard might have the best mechanics of any trial boss. Love the mirrors and the sensible use of adds that you have to control with the mirrors and the group. The knot running is reminiscent of Chaosball, but its like nothing else in PVE. Yes, I can see some frustration with a group dying on the run to the final boss, but again, it rewards group coordination. The final boss again is manageable, if not easy, as long as the group coordinates.
The obvious overriding theme of vLC is not just requiring people to communicate and work together, but rewarding them for it. The bosses are not overly difficult as long as the group is on comms and you have a decent plan on how to handle the mechanics. I've seen some say vLC is a pug killer along the lines of the twins from vDSR, but its not. The mechanics in vLC make sense. To this day, even after clearing vDSR many times, I still find those mechanics annoying and arbitrary.
Haven't run hard mode as I just played it yesterday (console), but am looking forward to it. I hope this is a sign of things to come for trials