I like multiplayer even with randoms, makes things more interesting. Yeah, some people can stupidly cart away a good investigation, but overall I prefer it, especially as a hammer user with boosted stun that the whole team can capitalize on. Though I saw that most higher rank people generally do know what to do on Elder Dragons at least, had some really smooth runs on Teostra and Nergigante for example. Vaal Hazak is still the n00b sl4y3r though.
One of the runs I had a Mushroomancer/Wide-Range support guy on my team, man what a godly build for multiplayer.