WME is really grat! I made my game: Sofia's Debt with it, you can see the result:
http://www.justadventure.com/Indepen...ofiasDebt.shtm
The FRED DEMO, made with it is GREAT!
The AGS quality is limited, you can do Semi-profesionl games with WME like Dark Fall, Monkey 3 or even better.