When it comes to the Megaman Battle Network Games something to keep in mind is that this can arguably called the first real game, the first game was a bit of a mess with lack of features and the environments within the net being literally the same design. This is the game that started the trends that stuck throughout the entire series and made it a classic on the GBA.

My thoughts on my ratings however.

Graphics: I gave it a 8, mostly because everything but the NPC sprites look good, the NPC's (most notably a little boy who I swear looked like what would happen if Kermit the Frog had a love child with a human) just don't look as good as the main cast. However the chip design, enemy design and the places you go do have a lot of detail to them (check out Dex's room, has two GBA, you might not even notice that unless you randomly pressed A on the desk)

Sound: 8 as well, because the soundtrack is good (I love that opening and will always listen to it as I load up the game) to be honest though it does get a little grating hearing the same sounds and music, but it at least isn't too much that it ruins the experience, slight annoyance at best.

Addictiveness: Nothing is as awesome as pulling out an advance program on a bunch of virus's you could sneeze on and they would die horribly. Honestly the virus busting is a lot of fun, and while this game isn't as fun as the later installments it does a good job at what it does and while not my first choice I would keep coming back to this (heck doing a let's plays because I felt nostalgic)

Story: Let me put it this way without any spoilers, beware of who you trust. The plot twists here are good, the villains are memorable including the bad ass himself Bass (or Forte if you wish) Although I will have to point out something, this is a rated E game but I've seen guys swear, a little girl tell our main hero he missed out seeing her naked (rescuing her from a gas problem, its early on you will understand) and a guy getting blown up in a subway, no I'm not kidding bout that last part, he is told he is useless and then is blown up with a suite case bomb. Talk bout getting crap past the radar.

Depth: Gotta say its pretty deep, though not as deep as the others it does pack in enough side quests and extra bosses to make it worth scouring the net for.

Difficulty: I gave it a 6 because well....its varies, the battles themselves are more on luck of the draw (but you can set the deck) and timing, if you are good at timing this would be lower but new comers to this game might find themselves having trouble. And the puzzles at times can be hard to figure out or the answer isn't as obvious as you might thing. Having a walk through can help you if you are stuck in the story but at least by pressing the left shoulder button (on a GBA or if you use a controller and set it for that) Megaman (or Lan in the net) will mention what you need to do, so you can help yourself out

Overall: I gave it a 9 because it is a classic, a great game with great characters and story, and I gotta say, enjoying replaying it.