I do think maps should have valid information whenever possible, however I also believe in being basic and concise. For example, a platformer with powerups (eg. the Ninja Gaiden maps) should have the powerups revealed, but lengthy written gameplay strategies, while certainly not discouraged, I would probably never do myself. I don't want to take a map in its pixel-perfection and risk grammatical or spelling errors, or even just saying things a certain way - but that's the obsessive-compulsive-perfectionist in me, and I think a lot of mappers have a bit of that. Though, again, I wouldn't discourage it if someone did want to do it - but conciseness is nice.
(Keep in mind I haven't mapped in a long time, and I've never made a map that was even comparable to the best maps here. But I can say what I like, even if I've never reached that point myself.
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As the guy who runs this site, I do not often reject submissions, however, on the rare occasion I have, and most of the time it is because the maps are redundant (i.e. another version of the same map when one of the two isn't necessary). Some would say I should screen the submissions more, and some say I should screen them less (I may make a bad judgment call one day) but that's another can of worms. In any case, it seemed your unlabeled Zelda II overworld map was desired by others here, so I put that up alongside the labeled one. (I do enjoy unlabeled Zelda overworld maps too, *coughLightWorldofALinkToThePast* so Zelda II should be no different.) Perhaps make use of the forum when making potentially duplicate maps, or any maps, really, as we are now.
If you consider what a map is, you would think of areas being labeled, and maybe some information about those areas. Unless an area is particularly picturesque, I think the map should be able to convey at least some extra information, and in the case of RPGs, there usually is something there to point out. I realize that makes it a longer process to finish what would take a very long time even without doing so, but I would think it would be worth it. If you're lost in a game, like if you were lost in real-life, would you want a map, or a postcard? Even if the postcard was a panoramic photo showing the entire area, I think a map would still be better (especially in these cases when you'd still be getting an image of the area anyway).
I do very much like what you've been doing with the
Soul Blazer maps. The descriptions aren't long, and they exactly convey the info one would expect to find on a map. I would like to see more Super NES RPGs (and action-RPGs, and adventures, and any derivative of the genre) mapped at all, but knowing the treasure chest contents and warp points and info on how to progress makes them so much more awesome. Please keep up the good work!