I played the KF2 update tonight and it's ass for a casual style of play. Maybe the hard core folks like it, I dunno but you can't just pop in and casually light shit up for a while any longer which is, you know, kind of the fun of killing zombies.
Keep in mind that it's early access. I opted into the beta over the last week and I can tell you that they tipped the balance too far in favor of reducing the dominance of any one perk. Though, happily, they have made a number of positive changes in reaction to the feedback. I think there's still quite a way to go.
Remember, that this last big update introduced the Sharpshooter so, unsurprisingly, that perk currently rules the roost. Others, like Firebug and Support are still awaiting a rebalance. I'm a Firebug player, and I'll reluctantly admit that it was ridiculously overpowered, though now he's not much more than a distraction.
Once the balance is right, I think high perk levels playing on lower difficulty levels ought to be able to solo easily enough again. I don't think they're going for a pure shooting-gallery style game though, so it might not be as easy as it once was.
God. That sound

ing awful. I hope they fix this. One, I like solo play and it's been one of my favorite things about the KF series. Two, I hate games where if you don't have the right team with everyone playing their part then you can't win. What do they want us to do? Stand in a straight line formation and have the appropriate class pop out when an enemy we're strong against pops up? This isn't Pokemon. I noticed this last time I played demo. Grenade pistol shots to a bloats? Did near nothing. And the sirens would eat rockets like they were nothing. If they keep this up, I might have to go back to KF1.
I'm hoping it doesn't go that route either. I don't usually play with more than 2 or 3 people at a time, so rock, paper, scissors won't work well for me. I think that they've done a pretty good job of righting wrongs based on feedback, so I'm hopeful the balance will once again tip in favor of the survivors.
Don't shoot bloats with explosives... they have big-time resistance. At level 15, if I recall correctly, Demo can choose a perk to give his explosives 100% resistance to siren screams. His fortunes change greatly after meeting that milestone.