I really hated this expansion at first due to the survival mode. It's really hard and found it frustrating. I'm a trophy hunter though so a friend and I kept trying to the point we were addicted once we learned the best equipment, combos etc. It forced us to try weapons and items we never bothered before finding some of them amazing. By the time we stopped playing we could make runs to level 15 - 17 without issue.

It's a hard one to recommend though as I can see how people could bounce off it but we had a great time with it after a rough start.