Scratch

Even though you might compare it to 'real' programming languages, Scratch actually does have a lot of potential. New Scratchers often see Scratch's simplicity and mistake it for low potential. But that's not true! Here's some example projects which really use Scratch's potential:


Saisyuu Hakai
by floatingmagictree
An excellent platformer game. The game itself is simple, but extremely well-made.


Fable Quest RPG - Mystic Journey
by 08jackt
An excellent RPG. You have to see it to really know what it is.


One screensaver, 100s of possible patterns
by recycle49
Scratch isn't only for making games! Shows the potential of the 'pen' blocks.


The. Best. Project. Ever.
by floatingmagictree
The title explains itself. I don't know how to describe it other than that.

And then, there is possibly the most advanced project in existence:

LINE Tenis
by RHY3756547
Simply amazing. Full 3D. Only one sprite. And one script. If this doesn't show Scratch's potential, I don't know what does.

BEFORE YOU START POSTING "But what about my project..." PLEASE COMPARE IT TO THE ABOVE PROJECTS, AND CONSIDER IF IT TRULY SHOWS SCRATCH'S POTENTIAL.
If you want to suggest someone else's project, please do so.