I think Graveyards are fun. All you have to do is walk to your handy-dandy Arsenal Station no more than 10 steps from the elevator, equip your shadow-defense armor and an elemental sword, and faceroll to victory. Mountains of crowns and heat from Zombies, no challenge at all outside of remembering to kill the Phantoms first.
There are two reasons for this. First, Zombies suck. They're slow, predictable, easy to interrupt, and they don't aim their attacks. Second, there's an Arsenal Station right at the slagging entrance, despite the fact that Graveyards are supposed to be inherently hostile to life, so you're always going to have the best possible gear for running them unless you're being a tryhard and handicapping yourself on purpose.
The issue with Zombies is just a small part of the problems this game has with difficulty, which can be discussed elsewhere. However, there's no reason that pesky Arsenal Station can't be removed. Without it, you'd be forced to make choices about your gear again. Either run with Graveyard-based equipment (or hey, remember that normal-damage weapons exist) or take the risk of making things much harder on yourself. Equipped all-shadow weapons for a Decon Zone? Welcome to hell.
Anyone have any other ideas to make Graveyards actually challenging again?
Add Bombies, maybe? Maybe Deadnaughts too.
Make Phantoms harder. They're too easy. Perhaps give them a shorter cooldown after they die? Move faster? More damage? New attacks? Personally, I'd like the Phantoms to have an aura attack of some kind. Say it has a ring surrounding it, like a Grim Totem. Each time it pulses, you take damage. Or maybe if you stay inside the circle for too long, you start taking continuous damage.
Nastier traps. Maybe a long corridor lined with spike traps, with several layers of timed explosive blocks and stone blocks at the end. At the beginning, there's a switch that lowers the spikes and a gate in front of the spikes. You have several seconds to make it to the other end and break your way out before the switch automatically turns and the spikes return, and the gate goes up so you can't run back outside the spikes corridor. Image what would happen if you got stuck in there with a Deadnaught.
Make Zombies more powerful/dangerous.
Remove Arsenal stations.