I'm going to write a review for Digimon World 2 only, so here we go
Graphics: Well for their time, I do like the graphic in the game. Even though it's nothing comparing to the 2010 games, it's still had a great graphic for their time
Storyline: The storyline is very interesting in this game, but the problem is the Digivolve or the evolution of our Digimon. When we hit the highest level for our Digimon, We have to combine our Digimon character with another Digimon. Problem is the result. For example, I combine Biyomon with Leomon, and then I get Tentomon...the DNA combination in this game is a bit weird, but the storyline was good.
Music: I really like the music in this game. They did a good choice of theme per stage. Regular stage has its own regular theme, boss theme also has their own boss theme, but some bosses do have their own theme which make it more interesting.