Batman : Arkham Origins question (and alert of sale)

First up, I'm going to point you over to HERE where the steam version of B:AO is on sale for under £4, and the sale is ending in just over 8 hours from the time of this post.
(don't forget to tick the 'gift' option if not for yourself!)

Now that's out of the way, I have a quick question for people who already own the title : Is the multiplayer worth it? Is there any real activity in that game or has it already died down? Is it an absolute requirement for all eight slots to be filled for a game to commence? That's it. Sure it seems like a waste of a thread, but hey, high-budget non-standard multiplayer games are something we can all appreciate, right? :3

edit : Looks like multiplayer is still a go. Maybe consider roping in some of your friends, and once us singleplayer folks have caught up, we could have a Steamgifts rumble or five~