I can attest to this, multiplayer CR is a fucking blast.
Im glad GD is an offline, single-player game first. But lots of people sleep on multiplayer- The best experiences I’ve had in the game have been multiplayer ones. Ill never forget being new to the game, and joining my first multiplayer session. The group was about to enter the Steps of Torment dungeon, I happened to join right before they popped the seal on the door.
Id played through the game almost up to Homestead, but had been too scared to even attempt the dungeon on my own, so had never even witnessed the door opening. I remember the feeling of excitement and adrenaline, passing through that entrance and losing my connection to rifts. The other members of my party, 2 melee builds and a pistol/shield commando, made sure I knew if i died, i couldnt return to the dungeon.
Naturally being brand new to the game and not yet a member of these forums, my mind started racing, as i thought if i died inside the dungeon my character could be locked out of it for good, not just in that session. My adrenaline peaked and oh my god what an awesome experience that dungeon was- i was a DW blademaster and using Riftstones in both weapons, so 4 mobility skills (shadow strike, blitz, and 2x rift strike or whatever). It felt like a true MMO experience, particularly that first room that the doors lock behind you and those waves of enemies spawn. I was like a rogue, backstabbing everything. God it was great.
I have tons of stories, i could write a book about them. Maybe i should. Crucible multiplayer is the shit, but ive found SR multiplayer to be less exciting due to the focus being kill as fast as possible and if others cant keep up oh well, then in boss rooms noobs get booted from the session for dying in there and causing bosses to heal up, smart noobs wait in town while the real players defeat the bosses, which also kills the fun.
CR on the other hand, like @fordprefect mentioned, due to its stationary arena environment, can be played like a tower defense using the banners/beacons, and this allows for better tactical involvement from all parties. Noobs will still struggle and youll get the occassional XP leeching scumbag that stick on the sidelines while everyone else is fighting, but the best parts of this mode stem from the fact that everyone is always together, in a set location that affords the ability to strategize in a cleaner more reliable way than in SR. And if a douchebag is leeching XP on the side you can quit and rejoin using your retaliation witchblade with warcry and bloody pox (fevered rage variant w/o the enemy debuff nodes) to pull all enemy aggro to your position and just follow the douchebag around everywhere so theyre forced to contribute.