The good news, if the stage select screen is any indication, is that Dr. Wily created the eight "Robot Masters" out of whatever he happened to have lying around. I guess he couldn't be troubled to get high quality parts, or maybe couldn't afford to really go all out with it. So he decided to take a floor fan and put some eyes on it. Some lumber and stick a microchip in the top. You know, whatever works.
In addition to the sharper graphics, one of the first things you notice as you play Mega Man 2 is that music is really quite good. The music in the first game was fine, but I also can't sit here and say that I actually remember any of the tunes or how they went. Mega Man 2, by contrast, has a few really great numbers, particularly on the first Dr. Wily stage. Which is a bit of a surprise (although perhaps it shouldn't be), because when we look for stellar video game music, we often tend toward games like RPGs that are trying to set up an "epic" kind of atmosphere. So bravo Mega Man 2 for saying, through your music, "I am what I am, and this song is gonna kick ass anyway."
That all said, the stages do have nice, distinct feels to them. Air Man's level takes place, predictably, entirely in the sky on various platforms. You'll even have to ride on robotic clouds to get through part of it (which might be a little overboard in the story department. Why is Dr. Wily manufacturing robotic clouds?) There's a good deal of challenge and outright panic from lasers in a stage or two as well. When you enter a given screen, laser beams will begin to fire. These kill you on contact, so the goal is to pass the screen before the lasers block your ability to do so. You'll probably die quite a bit, and it's very hectic, but an interesting concept.
There are also now energy tanks to be found in the game, or E-tanks for short. These are found in often hard to reach places in the levels, and are collected for use at any time down the road. Opening the pause menu will show how many E-tanks you have, and using one will completely fill Mega Man's life bar. This is a great addition for difficult bosses and the like. Enemy special weapons also bear more use outside of boss battles. While the convention of having each weapon be extra effective against a specific boss remains, now some standard enemies can only be damaged by special weapons. There are more weapon-specific shortcuts through stages to be found as well. While you still don't really know what weapon will help in what way outside of trial and error, the fact that they have added worth is a bonus.
With all this, you'd think the game's difficulty would be significantly higher than its predecessor, but you'll be pleasantly surprised. For one thing, in a move of typical Japanese gaming arrogance, Capcom made an easier difficulty level for the North American release of the game. Rather than call this mode "Easy," they called it "Normal" and made the original product "Difficult." Yet even on "Difficult" mode, the game isn't as hard as the first. Part of this is from the E-tank and added weapon functionality. Part of this is a tighter control that means Mega Man doesn't scoot as much when walking as he used to, which was a minor problem the first time around. But the main advantage was the password system. As the game still lacked a save function, players could now write down passwords that contained which stages they had completed (and therefore what equipment they had), as well as how many E-tanks they possessed, allowing them to pick up where they left off after any length of time. It was a great idea and helped buck the notion that "real games" had to be played start to finish all at once.
And that fight is interesting, because after enduring the long battle with Wily's new big riding contraption, he leaps out all kung fu style, in slow motion even, with wind blowing his hair and labcoat. And then he transforms into a flying alien and starts shooting you. What in the world. It's a great twist, and even cooler when you defeat him and realize what's actually going on (I won't ruin what, but suffice it to say appearances can be deceiving). But infuriatingly, you let him go. Again. Artificial intelligence my butt.
Mega Man 2's improvements to the formula weren't drastic and didn't alter the feel of the game, but there is no doubt that they were all important and successful. The public must have noticed, because the game caught on like wildfire and suddenly Capcom felt justified in keeping the series alive. Mega Man 2 is not a perfect game, and possibly not even an excellent game, but it had to be good in order to survive, and it definitely is, and definitely is better than the first. Check it out if you haven't already.
Bottom Line: 15/20