Mega Man ZX Advent review at Nintendo World Report.

"The Mega Man series has been around for over twenty years, and not much has changed in that time. However, the ZX games for Nintendo DS infuse a lot of life into this venerable series by expanding the most iconic element of the entire franchise. We all know that Mega Man gains powers from his defeated foes, and he can then use those abilities against other enemies and to reach secret areas. In Mega Man ZX, you copy entire bosses, allowing you to transform into the defeated characters and use all of their moves, not just one special attack. This idea makes the game more interesting because each transformation has completely different abilities, movement, speed, and power. The feature isn't completely exploited in Advent, the second ZX game, but it does make the game more fun and more flexible than most of its predecessors."

Full Source: Nintendo World Report