Hm, well Neti, along with a handful of other people, has already written a tutorial on AdvanceMap's features so nothing new there (plus, his was explained very clearly for someone for whom English is their second language). Anyways, if we take out your AdvanceMap "explanation", then the tutorial itself is fairly empty and devoid of anything really helpful. Let's analyze your mapping method:
Step 1: I agree with this. It is always best to plan out your map before you actually begin the process of mapping. So far so good...
Step 2: Add finishing touches!? What about the actual mapping? You go straight from the pre-mapping stages to the post-mapping stage. I think that the main reason why the maps in the Map Rating Thread haven't been as good lately is most likely due to the fact that people don't have proper instuction for the step you missed: the actual mapping. I think a mapping tutorial is pretty useless without telling people how to go through the long, tedious process of making the actual map.
Step 3: Okay, checking your maps also makes sense. Nothing to complain about here.
As others have said, I respectfully disagree on your point about square maps. Square maps can look good too; the trouble is not making things too square. There is a certain, almost nostalgic element in square/Nintendo-styled maps that gives them an appeal which can't be matched by "natural" maps. And when it comes time for playing through a map in an actual hack, square maps are that much more enjoyable to walk through and experience.
So I'd recommend that you revise your tutorial on pretty much every front. You need to go into more detail on the actual process of mapping, which is what this tutorial is focused on at its most basic level, and perhaps even rethink your idea of a good map.
Toodles ~
