I know, but I like seeing the professional ones for two reasons:

1. I like to see the reviews MOST people are going to see.
2. I love their flashy video editing and professional delivery without listening to some dude slur his speech, cough, fart and drop 20 F-bombs.

GMAddon1: Adds almost every single monster and NPC from the main campaign into GM mode, plus a few large custom maps to use in GM mode.