I'm going to be honest, I have strong suspicions that the cast of Silicon Valley may have imbibed one or more mind-altering substances before filming this particular look at Halo 5.
What's interesting about this video is that it's not very interesting. Other Clueless Gamer segments are funny or surprising, but watching two teams of three people each badly play a first-person shooter against each other provides a pretty flat experience.
Sure all the individuals here are funny, and Halo 5 is certainly being promoted, but this isn't the best venue for this sort of game, even though the format has provided some big laughs in the past.
Off topic, if you're not watching Silicon Valley, you should fix that.