Disgaea is really good series. It's fun, interesting and has a lot of funny jokes and references. It definetly deserves way better sales than now.
I only played the 1st one, but I really want to play Disgaea 3...gotta start saving money for PS3.
About reincarnation itself...besides other people's information, one tip:
To complete disgaea 100% (defeating all optional bosses for example), you need massive grinding. In Disgaea 1, transmigration (aka. Reincarnation) you were storing levels everytime you reincarnated (for example you decided to reincarnate at level 250 and then later at 300, now you have 550 stored levels). The number of stored level decided on how many extra stat points you could give to your character after reincarnation. You could store up to 186k levels if IIRC. I don't know the reincarnation mechanics of Disgaea 2 and 3, but if it's about storing level again, find a sweetspot when levelling up and reincarnating.
This will help you to save time...I read on gamefaqs that exp required for lv 2000 is 4 times higher than for level 1000. I think it's pretty obvious that levelling to lv 1000 and reincarnating is faster than leveling to lv 2000 and then reincarnating...just make sure that you won't lose too much skill that way (in disgaea 1 when reincarnating as "Genius" you lose about 5% of total skill and weapon mastery levels).
Hopefully I didn't kill off anyone's desire to play this game....don't worry, it's still pretty fun without all this reincarnation stuff (however it extends the gameplay time several times).
