It was... Fun?
This game has elements like Battle Network 3 but unlike Battle Network 3, this game has a new way for Megaman to gain new abilities which allow him to use other navi's abilities to help him, which to many was really awesome.
It was addicting to play for me and the thought of getting other navi's abilities made me want to play even more. This game also had another version which featured different things to do almost in comparison like the Pokemon series different versions.
All-in-all, this game is a good game. If you enjoy adventuring around as the Blue Bomber [Megaman] himself then this game is for you.