Pretty sick game, good story line, fun battle system, and enough extras to keep you busy for 20+ hours.
The story line isn't exactly AAAE but it's interesting and makes you want to read the speech bubbles instead of just mashing the B button until they disappear.
Graphics, are typical for a DS game that hasn't been hyped out of proportions.
The battle system is now over-the-shoulder and has an interesting card-based system that makes the battles, strategic, and chaotic at the same time.
Definitely worth buying, bottom-line a solid game you won't regret buying, and will have tons of fun playing for a while.
One downside is the Wi-Fi, you can't battle online, but if you must have that, you can just buy the newest one, just don't expect to follow some of the flashbacks.
Overall, a fun long-lasting game you should buy, regardless of your experiences with other Megaman titles.