What went wrong with grotesque guardians

Apart from 10+ people spamming the door into the guardians, here are a few extra ideas floating around.

1: 1 key = 1 boss fight.

2: Increase the value of loot per kill.

3: Make granite dust tradable.

4: Make a normal instance.

5: Move the entrance somewhere that doesn't look so awkwardly chucked in.

Some good things (personal opinion)

1: the pet of course, looks fantastic.

2: mid-level bossing.

3: interesting mechanics.

It would be nice to see some alterations, even some ideas that aren't mine, but it probably won't happen.