I think this is pretty accurate to what Mockingjay was like. It pretty dark, the whole series is dark but Mockingjay even more so. The first two books were full of action and surviving the games and was action-packed and fast paced whereas Mockingjay was mostly about all the characters' issues.
Let's see, I don't remember Mockingjay too well, but I'll try... we've got feral Peeta, going all 'Katniss is a mutt' in the top right. Underneath there's Finnick with his rope. Katniss is crying her eyes out hysterically, while being filmed (you know, her trip to District 12) and Johanna's freaking out in the shower (fear of water). I think the blue coverall guy is Gale, he's got the bow. The description makes it clear that this is just a random thing. The girl with her hands over her ears is Annie, trying to deal. Bottom right corner- Haymitch wanting a drink.
Laughed for twenty minutes, honest. Though I have two disagree with you— both Annie AND Gale had a head's start. The guy was bloody homicidal. It's not love-triangle bias, really. You could make a meme out of him. "Blow up ALL the stuff."
While I don't really think the writing quality of Mockingjay is really that bad at all, I just can't stand how BLEAK it is. This pic says everybody loses it; by the end, I was pretty much ready for the anti-depression pills, too.
Oh, the writing's not bad. I think it was just...yeah, the general bleakness. And since the previous two books were dark, with some semblance of happiness at the end, readers expected that in Mockingjay.