I was pretty hyped, having just completed the other games to try the new and improved Mega Man. All in all it is a solid experience. I really liked the power gear system, the weapons and the bosses. All 8 robot masters felt unique and their weapons useful in many encounters. The only thing I didn't particularly enjoy was the length of the stages. I prefered the shorter and denser levels of the previous games.
In conclusion, I would recommend it.

A great and fun game, mechanically felt like it could hold its ground beside the NES titles. However I think that towards the end it overstayed its welcome.

Really cool game. Even from the start of the game the super arm felt original and yet familiar. Its upgrades felt worth buying. The boss weapons were ok, but they were outclassed by the super arm. The bosses themselves felt unique and memorable and I loved the fact that I faced a new final boss.
Overall a pretty good game and, most impressive, on the game boy handheld console.