Darklurker was really fun but I didn't find him to ever really give me that hard of a time. It took me only 2 or 3 tries to kill him with my no-shield melee build. What exactly about him is troubling people?
I seem to have a hard time with "easy" bosses and an easy time with "hard" bosses in Souls games, because some of the hardest fights for me are ones that others seem to just breeze past.
It's more about learning his/her pattern and being forced to fight those Phantoms if you fuck up. Once you figure out the pattern it's not so bad until phase 2 happens and while you can get at least 1-2 more hits during the beginning of that process, it's really hard to tell what the other one is going to do.
Got halfway through Punisher War Zone and had a bug up my ass to fight Looking Glass Knight. Took me about 5 attempts, he likes to summon very early in the fight and this time he summons human players. On my last try I think I got lucky and fought an invader who either (A) wasn't very good or (B) gave me a chance to heal. I managed to kill him just as he summoned a 2nd dude.