Disgaea is great and has a lot going, but I love and hate it at the same time.
The humorous story and crazy characters really appealed to me, and gave me a strong incentive to see the next cutscene. There are dozens of (literally) laugh out loud moments, and the words "horse wiener" will forever be burned into my memory.
However, the gameplay in Disgaea is really love-it-or-leave-it. I like Strat-RPGs, but I don't like all of the micromanagement and minutiae that bog down the FFTs and Tactics Ogres of the world. Disgaea takes all of that busywork and multiplies it by 100.
I simply could not finish the game due to the amount of leveling up and character building that was necessary. If replaying levels for experience and fighting a lot of extra battles for the fun of it are your thing, then Disgaea is the game for you. If you're like me and need forward progress and a minor sense of achievement after each session, you may want to think twice. Oh, and if you don't have hours and hours and hours to devote to it, don't even think about taking it on.
As much as I wanted to like it, the fact is that it was far too dense and intense for my taste, but I absolutely loved everything about it. besides the gameplay. Casual gamers and people with busy lives need not apply, but it'll be heaven to RPG devotees.