Heroes of Ruin is a new dungeon crawling game for the 3DS. It doesn't really differentiate itself from other dungeon crawlers and can get repetitive, but it is simple and very fun in short bursts.
What did I like? I personally found it easy to pick-up-and-play; the controls are actually very basic and not hard to master at all. At the beginning of the game you get to chose a class (out of 4), and although there isn't much customization, I think it's enough. I chose the Savage which is a big beast that is heavy on melee attacks. Your normal attack is performed with the B-button, and you can dodge and block with the R-button. The rest of the buttons are used for your special attacks, like a chain attack that drags an enemy towards you (like Scorpion in Mortal Kombat). I genuinely appreciate a simple-to-pick-up game, especially for a handheld. I also like the fact that the dungeons are generated randomly. If I decide to play through it again, at least it will feel a little different. It also has a decent amount of quest-per-dungeon (one complaint for this below, though). There is a cool feature that (I think) most dungeon crawler fans will enjoy, and that's the ability to sell loot immediately from the dungeon, with no need to travel back to the hub world. I also enjoy the graphics, specifically the environments (another complaint below.) Nexus, the hub world, was easy to navigate. The 3D was actually decent, but I don't see myself using it often. I am a fan of exploring in games and this has plenty of it. Also, the RPG elements like leveling up are easy to understand, another big plus.
What did I dislike? It doesn't really differentiate itself from other dungeon crawlers and can get repetitive, which is the biggest issue for me; most of the time will be spent looting and button-smashing. The side-quest aren't really deep and are repetitive. So far, most of the side quest are fetch-quest, like go get some wood then bring it back. Also, although the environments are great, the character models were often bland and blocky. The gameplay can get a bit sluggish as well. Maybe it was because I was playing as a Savage, but the character runs slow.
Overall, if you're looking for a dungeon crawler or a simple-to-play game, I highly recommend Heroes of Ruin. It's probably best to play this in short burst so it doesn't get too repetitive. Also, you can receive daily challenges for this game which should add more game time. I purchased it from Amazon when it was $30 and I have enjoyed most of it so far. I will update this review when I finish the whole game, and let you know how long the game is.
*I cannot comment on the online play since I haven't played it online.