Just finished this.
I started copying YouTube guides from the 5th night onwards. I found the gameplay to be difficult to the point of not being fun. Especially when you're dealing with boss' attacks, random traps, and all other kinds of frustrating bullshit. Even when copying guides, I was still dying way more often than I'd like, usually to things completely out of my control (hey Atlus, when you have an antagonist outright state that the main character will need luck as well as skill, you seriously need to re-evaluate your game design).
I love the presentation of the game (it doesn't disappoint after playing Persona 4), but the gameplay brings the whole thing down a great deal, in my eyes.
I don't regret playing through it, but I can't bring myself to play through it again, and I'll be putting it on eBay tomorrow. I'll watch the other endings on YouTube (I got the best Katherine one).