I think the original Mega Man is still the most challenging of the bunch, so it can be worthwhile for that reason if that's what someone's looking for. It's party because there are no energy tanks or passwords, though I also feel like the weapons aren't as ridiculously powerful as they are in subsequent games (here's looking at you, Metal Blade). Plus, no slide and no charge buster. I also like how it has a scoring system, for some reason.
I think Mega Man 1 is similar enough to its sequels that if someone didn't like it at all, it seems unlikely the rest would change that person's mind.
@Zero Looks like Mega Man X4 is indisputably the best Mega Man game.
@Mop it up Definitely agree with this post! I think MM1 actually does a good job at making your sub-weapons useful but not overpowered. MM2's Metal Blades were OP, but for most of the other games, I just stick with the Mega Buster except for boss weaknesses.
Except MM9. MM9's weapon set was the best in the series!
Oh also, thanks for reminding me to knock X4 down a few pegs, myself. It's not bad, but it's a step down from the SNES games.
Except MM9. MM9's _____________ was the best in the series!
You can fill in the blank with just about anything, and it'd be true. But yes, the weapons in MM9 were easily the best in the series. I played through the game with each of the eight weapons exclusively, and it was not only feasible to do so*, but really fun and different with each.
As for Mega Man 1, it's a solid game, but way tougher than even the very tough 2 and 3, in cheaper ways than usual. It's worth playing, but I wouldn't introduce someone to the NES games with it. Actually, for beginners I'd consider Mega Man 5 first, since it's the easiest.
*Tornado Blow and Black Hole Bomb aside, but even those didn't require as much switching as I thought, considering their energy requirements
I remember another reason I found MM1 tough, and it's the robots. I feel like their movements are more random than they are in the sequels (except MM2, that has some random ones too), so they are more about quick reflexes than they are learning patterns. Starting with MM3, the robots were more predictable and sometimes more simple. I guess that also means there may be a little luck involved with getting through them unscathed, which some people may not appreciate.
My fave weapon set is probably MM4. Probably because it fixed a lot of 2's weapons and made them usable/good.
@GameDadGrant I like it. I tend to prefer the more chubby classic designs, like you'd see on the Japanese boxart, but these are cool action shots. I especially like the attention to detail of the backgrounds.