I've been playing this game for months and I'm still not bored of it. When I came to this page I was very disappointed by the sheer stupidity of some of the reviews.
One of these reviews said: "I was supposed to go to random places and kill as many demons as I can find, there is no specific quest or storyline to follow. I killed a few of the bosses and gained nothing, just another dead end."
There are so many things wrong with this. First of all, you aren't supposed to go to just random places, believe it or not. You have to figure out where you are supposed to be going by reading the description of items you pick up along the way such as keys, weapons, armor etc. That will tell you a bit about the story and characters, and the descriptions for keys will usually literally tell you which door they open.
Secondly, there is a storyline, and a fantastic one at that. What did you think the large cut-scene was at the start of the game? Just some irrelevant garbage? You need to actually pay attention and use your senses to find out more and more of the story as you progress. And if you are still really struggling that much, you could always just look it up online.
And finally, you don't gain nothing from killing bosses and enemies. You earn keys, unlock new areas to the game, find weapons and more equipment that will help you put together pieces of the story and find your way around- and you gain significant amounts of souls which you can use to level up.
So to sum this up, don't bother reading the reviews on this page. I'd recommend maybe watching a little bit of gameplay on YouTube (but not so much that it will spoil your experience) and deciding whether or not to buy it from there.
Absolutely phenomenal game. 99/100.