Reviews can only be so helpful. I would say beta-testing is still the best option for tileset makers, and the beta-testing team needs to include those who have made quality tilesets before or at the very least know what they are talking about. What could help a lot is some sort of formal public beta-testing procedure on this site, perhaps done by encouraging users to post their unfinished tileset in a separate thread so they can receive opinions and help. I suppose those who wish to help with beta-testing could also suggest and create tiles sort of like what LMAT did.

Also, tilesets in general could use more of the following:

• Shading and shadows. Putting more effort here can make a good tileset great.
• Tile variety. For example, three different types of ground and building tiles all with different color schemes. Tube Electric is a good example.
• Transition tiles. This is especially needed for the sprite layer so that level builders aren't required to sacrifice a background layer for eye candy.