For old player, it is well known that Gilga is a love-hate relationship class. High cost and good enough return. The problem just not new player friendly. Yet, it for a period of time during the time that SS still can critical hit and only effective used by Gilga. The SS deity gone and Gilga finally get a seat in the game.
Good times don't last long, skill SS rework, no critical hit and formula change. The investment in critical build is gone, many players retried or switch to deity and RS. Few Gilga players keep going on as SS still in acceptable range, although the damage not enough and no good cost efficiency.
More, content update, horde mode, class adjustment and equipment update. It not took the beneficial from melee enhance, no follow up in multi target and extremely high cost haven't improved. Gilga missing out all the adjustment. Gilga haven't got a positive follow up and start outdated. All other class take great on different aspect, fast raid RS/deity/Herec, mega Pavane/Maji AOE for horde or god tier GS for all content. It just keeps powerful on turn one in PVP offensive. Only for top end setting and AL. Facing theses, various players still keeping complain Gilga that too powerful.
For new content, celestial class.it doesn't improve the situation.
--hercules
We all know how powerful it is. Without it, just we face negative status in all time and unable to take action. No ability to restraint negative status, just spend all time to recovery. Gilga get higher up bound and lower action ability in the same time. A powerful class with no action. Unlock it and switch to base class for a normal game play.
--ursa
The class auto attack. Obviously, without that skill, it is not ready for the current environment. Powerful of auto but not the class.
Under this environment, it is frustrated and no one would pay for this extremely cost class. It wouldn't have new joiner. Only few enthusiastic player keep going on.
Face it and give some love to it.