It's decent. It follows the story of the first Disgaea, but only the last half is the same storyline. The first half is very different.
They use the same voice actors as well, so it is very genuine. If you liked Disgaea the game and its style, you'd like the anime. Though I was a little embarrassed watching it around friends sometimes. I forgot how effin cheesy Flonne is...
I'm kinda tempted because my 5 year old has a love of penguins, and I figured a lot of exploding prinnys would be entertaining for him. I just wonder if there is anything I shouldn't expose him to. (Just as a note, I haven't gotten that far in the first game, so I don't know where the plot goes.)
Is Guin Saga as good as the reviews suggest? Having a real proper sword fighting manly fantasy show sounds appealing, anime or not.
I think the books are very good. It has very much a Conan feel to it, and some interesting characters. While the character arc is covered in the 5 books, it is too bad that more of them haven't come over. (Apparently there are 130 books in the series!)