I haven't been on in a couple weeks but the player base was on a pretty steady decline. The whole PSN debacle really sucked the air out of the room. Otherwise the game was tons of fun despite its issues.
As a newbie, it will be a “don’t know what you’re missing” situation. As long as you’re in the lucky group not affected by performance issues and some of the more outrageous bugs, it should be a good time. But if you’re not in a hurry or facing a sale, I’d recommend waiting a bit longer to see if this upcoming patch addresses any of those tech problems.
I don’t think who you play with will affect your enjoyment. I maintain HD1 as being one of my favorite coop games of all time with an overwhelmingly solid community. I think that largely carried over to 2, even with the boom.
The biggest barrier to enjoyment is the game itself right now. But, being new, maybe the little things that irk people with hundreds of hours won’t impact you before they get fixed.
I honestly thought it sucked and found out you can't return PSN purchases at minute 16. Insert rant about the state of the gaming industry here.
Seems like a good game if you've got full team of friends with PSN who like casual shooters though. I've just played enough grinder shooters (aka Destiny) that the somewhat clunky controls and graphics just didn't grab me, much less another game where you have to play fifty hours to start having real fun.