As far as I'm concerned, the "Game Engine" is one of the best features of "Blender". but then who am I?
A little something to inspire the game engine community...
http://www.crossgreyn.com/Blender/jetski/Jetski.htm
although I like the game engine,
don't think it's the best feature

just my Op...
okay we all know that the game engine is the best feature, but theres no need to upset the people who chose poorly and work in the other areas. it takes a skilled person to use the game engine because you must know how to do everthing else in blender. he he he
hehe, that wasn't overly diplomatic.
I wouldn't exactly call it a feature either, it's a combined set of features that when put together equals a good tool for hobby games or rapid-developed games. And maybe in the future, pro games:)
Some good work you've got on the site, come by
www.elysiun.com and show it off at the forums there. There is more going on over there usually, at least with regards to the game engine.
Im still downloading jetski, havent checked out bobcat loader but it doesnt want to load:) Ill reply again with some impressions/comments once I've seen them.