I honestly have very little to criticize about the pure business side of the game. The gradual progression is not too slow, and you slowly develop from keeping a close eye on your own grow (the place where you, you know, grow) until you have plenty of people to do that for you.
If the only Disgaea game you can get is Disgaea 1 Complete, you will still enjoy yourself. It provides insane hour per dollar value if it scratches your team-building and strategy itches. You may just have to endure and work around some major issues. To those familiar with later Disgaea games, those older problems may be anything from a minor issue to you, to incredibly frustrating. You may still get some enjoyment nonetheless. While it can be purgatory, it is far from hell.
Dead Cells could have been a disaster – another game where your arm is behind your back unless you get lucky. Instead your skill is rewarded, and even when enemies become frustratingly fast, you always get the urge for just one more run. Good luck does help of course. It is not perfect, but it is dead close.