This is my first review, but seeing how this manga doesn't have one yet, I thought I'd give it a shot.
Hope I can do this awesome series justice.

Story (10/10) - On the surface this Donten ni Warau is mainly about the three Kumo brothers who are in charge of transporting prisoners to the inescapable lake prison. But this is only the beginning of it. It quickly becomes evident that the story has much more to it than that and the reader gets to quickly see the plot unravel chapter by chapter. Even though there aren't many chapters yet, already it is evident that all the characters are related in some way and will further contribute to the story later on.
(Keep in mind that the series is still ongoing, so this is just an evaluation of the story so far.)

Art (10/10)- To summarize the art in this story? "Wow"
The characters expressions are all done brilliantly, with emotions written all across their faces. The panels are all excellently paced with never a confusing, cluttered, choppy or dull moment. Simply breathtaking.

Character (10/10)- The characters in Donten ni Warau might be my favourite part of this spectacular series. From the oldest slightly pompous brother (but incredibly lovable), to the somewhat awkward middle brother seeking independence from his eldest brother's shadow the characters are all well fleshed out. And if that in itself isn't enough, the reader is also allowed the privilege of seeing all the different sides and colours of the characters, making them all the more real. Also, it seems that many of them, even the ones you know best, have a secret they've been keeping up their sleeves.
All this, and keep in mind, this series is just getting started.

Enjoyment (10/10)- Enjoyment? Unless you skipped over the review and straight to this, the answer to this should be pretty obvious.
But, just in case I'll summarize. Donten ni Warau- I can truthfully say I've enjoyed every moment of it. Filled with a mixture of happy, funny moments, sad scenes, suspense and a beautifully woven plot (so far) I've enjoyed every minute of reading this amazing series.