Mega Man is an undeniable classic, but by today's standards, is far too frustrating to be labeled "Must-Have".
Mega Man created a formula that would, to this day, remain a mainstay throughout the whole series. The game gives you access to 6 different stages (which would later become 8), and let you freely choose which one you would go to first. At the end of these stages, you'd square off against a robot master, and after defeating them, gain their weapon, which in turn is super effective against another robot master (such as Ice Man's weapon, which would be super effective against Fire Man). The stages in Mega Man range from pretty easy (Cut Man), to fairly difficult (Ice Man's, assuming you don't have the Magnet Beam). The Bosses at the end of these stages however, if you don't know their weaknesses, are however, very hard, if you don't know their weaknesses. They have very random patterns, and you're certain to die if you only have half a life bar left. A bit of trial and error will make you accustomed to them after a while, but such trial and error is just a pain in 21st centure conventions. After you defeat all these Robot Masters, you'd go to the final stage, and boy, is it hard. All of this difficulty wouldn't have posed a problem to the game if it had at least some kind of save or god forbid, a password system. Mega Man, like many old school NES games, has none of that. Luckily, the Wii has a built in pause feature that lets you continue where you left off, if you first press the home utton and head back to the main menu. However, if you should quit out of frustration and press the power button (believe me, you will), you'll have to start all over again. By today's standards, this is simply unacceptable, so just always keep in your mind NOT to turn the wii off.
Mega Man's audiovisual presentation is of averaga 8-bit fair. Each stage has a unique look to it, but with repeated tiles and with plain looking backgrounds. This is understandable for 8-bit, but given that the sequels looked far better is proof that it could've been much better. The Music in the game is pretty catchy, but also a bit repetitive, but not so far as that it's annoying. The sound effects are O.K., but nothing special.
Another weak point about Mega Man is that, when you're done, there's not much incentitive to go back and replay it. Each stage is about 5 minutes long, and the whole game on a first go clocks in about 2 hours. Some old-schoolers will gladly go back to replay it, but other won't find much amusement in it, given the game's high difficulty.
So the big question is: is Mega Man worth 500 points? I'd say yes, if you're aware the game is very hard, not all that long, and you're in it just for checking out the roots of a now-well established series. Is it fun? Compared to today's Mega Mans...not so much. So if a good solid gaming experience is what you're looking for, Mega Man isn't what you're looking for. This game is mainly intended for Old-school fans of the series. So if you aren't but still want to get to know Mega Man, perhaps it's better to wait for Mega Man 2 or 3. Those are some of the best platformers on the NES, and certainly worth the wait.