Alexander savage is the actual challenge and i don't remember the exactly percent but i read about 5% community cleared savage. Disheartening.
SE promoted the lack of interest on Raid scene. back to 2.2, Second Coil is released, best gear is 110 and soldiery items are 100. Three months after SCOB, they inserted Hunts and players who didn't put a step in SCOB got better gear than raiders, with bad lucks or they had to share upgrade items between party members, with zero effort. Just join a party, push 3 buttons and win. SE repeated the same formula in 2.5, the community learned and they though -"i gonna waste my time doing FCOB? Nah i just wait three months, wait for hunts and echo and try to faceroll the raid".
With Savage, SE tried to get a better raid scene, but the most part of the community were not prepared. Partys were unable to kill faust before enrage, unable to kill Oppresor and 0.5 before enrage and still a3S is the most hard fight, IMHO a3s > a4s with cheese.
I like Wildstar system to complete dungeons:
In time and objectives? Gold. => More Tomes, high % Random item / minion drop or materia
Objectives but out of time? Silver. => More tomes low % Random item / minion drop or materia
Just complete the dungeon? Bronze. => Same reward
PS: 1000 words limit are killing me :/