Yea,that's right,this is my least favorite map I've ever played in Left 4 Dead. But it is kidna amazing at the same time and had a lot of good potential for me. The main reason why I didn't like it is because it got confusing. I would always seem to go back and forth not being able to find an exit and end up going back to where I started. In fact this happened to me on literally every chapter. It was like a dark maze and right after I would get through one not to long later I would encounter another area where I get confused and backtrack and can't find the exit. It is the worst for me on chapter 4,I couldn't even complete the campaign because of how many times I would get lost. Another thing I don't like about this map is that when I do encounter a "maze" it's always dark and I can't even see my way out which makes it even harder. A large majority of the map is without light. As if daytime never comes and the survivors complete this in a couple of hours. And the final thing that makes this my least favorite campaign is that each chapter is way too long. Yea sure longer chapters are great but I find these ones a bit,too long. It's as if each chapter is a campaign themselves(not really I'm just trying to show you how long they seem) and whenever there is a long map it really gets boring because I can never get to the saferoom and I'm just not having fun. I still really liked the ideas and work put into this map though. The Labratory was just amazing! I loved it! But a lot of things combined in the map made me dislike it. I'm happy that so many people like this map and some even their alltime favorite but thats not the case for me,it's the complete opposite. I hope you understand why I dislike this map and maybe agree with me and that you can take this constructive critism and learn from it.