I finished up Arkham Origins and lucked into a really cheap copy of AO: Blackgate at roughly the same time. Blackgate is a 2.5D side-scrolling beat-'em-up with a few puzzles thrown in. The story is told through motion-comic-style cutscenes with full voice-acting and it revolves around riots that take place at Blackgate sometime apparently not long after the events of Origins. Black Mask, Penguin, and Joker have all taken control of a section of the prison and Batman has to go in and rescue hostages and take down the bad guys in his inimitable Batman way.
Sadly, the gameplay itself is sorely lacking. Armature Studios made an effort to translate the Arkham series' signature free-flow combat to a 2.5D game but it doesn't quite work. As you see from the image below, the game is fond of tossing upwards of 5-8 opponents at Batman simultaneously; this level of opposition is non-problematic in the regular Arkham games because Batman is free to move around at will and target any of his opponents at any time. Here, the Darkknight Detective's movements are restricted to left and right and the game determines his target based on which enemy happens to be closest and in the direction he's currently facing. This makes tactically targeting specific enemies needlessly difficult, especially when facing knife- or stun-baton-wielding foes, which require certain actions to eliminate. In small groups the regular villains aren't too difficult to handle, but when the game presents you with multiple groups of antagonists at once, things can get hairy.
However, the boss fights are the epitome of everything that you hate about the concept of "boss fight" in a game. Some of them, like Black Mask and Bronze Tiger, are pretty straightforward, but the Penguin, Joker, and Catwoman battles get progressively more irritating as you fight through multiple stages that require very specific attack strategies to defeat. I actually quit the game before finishing the Catwoman fight because for some absurd reason the counters don't work the same way in this conflict as they do in the rest of the game; the second and third stages of this fight require you to counter her attacks before you can go on the offensive, and because the controls for countering appear to be virtually unresponsive in this fight, I gave up after 9-10 attempts. Maybe if you're more dexterous than me, you'll have better luck.
The other aspects of the game are merely okay. The game includes a detective mode, like its big brothers, so Batman can scan the environment for ways to get around and collectibles. There are suit pieces that can be collected and different Batsuits can confer bonuses. For example, the "Beware the Batman" suit that you get by having an Arkham Origins save on your computer provides a 50% armor bonus against gunfire. A Blackest Night suit (grants invulnerability to most forms of damage) is available by collecting the pieces in-game (you'll have to get about 95% of the way through the game to get all of the pieces so it's not game-breaking) and another (Zero Year) that you get from having a WBID login. You can only collect one of the other suits per playthrough, depending on the order in which you defeat the game's bosses. There are also detective cases to solve, which essentially involves going everywhere it's possible to go and scanning all areas with your Detective Vision until you find all of the clues associated with a specific case (these just basically provide a minimal amount of additional insight into the villains' activities just before or during the events of the game). You'll spend a lot of time doing Armature's version of the crypto-sequencer, which means matching a sequence of three numbers until you get the correct combination to unlock a door or device.
You won't be able to get every collectible in each area the first time you go through it because, as in the other Arkham games, some require you to have access to gadgets that you have to acquire as you progress through the story. That's not so unusual, but navigating through the different areas of the prison using the in-game map is quite a chore because it often appears that you can head in a particular direction, only to come across a dead end or switchback and the maps are really just cleverly-constructed labyrinths. At least a few hours of my playtime I can probably chalk up to wandering around the cell blocks and industrial areas, trying to reach an exit or some other specific landmark that was gratuitously problematic to locate.
Everything looks good here and the voice-acting is first-rate, so there are no issues on the presentation side, but in the final analysis, this game is remarkably inferior to its full-fledged, 3D brethren. The action is mediocre, the puzzles aren't really puzzles at all, the boss fights are infuriating, and the story is really the only interesting thing about it. I spent about 19 hours playing but if you're the kind of OCD person who needs to get every achievement, you'll have to play three times so you could easily get the same amount of mileage out of this as you did from Arkham Origins. By then you'll probably wish you'd never heard of Batman, let alone this particular game.