Hey Wookie,
That's because Teebo WAS mean. He is the one who wanted to impale Solo! Teebo is a warrior, and therefore by nature should not be cuddly.
In fact, the Ewoks were a nasty bunch as a whole. Remember, they all wanted to roast and then eat our heroes. Not even their deity 3PO could change their mind. They were willing to disobey their god to settle their hungry tummies?
Maybe they did have a cute factor, but underneath it were a bunch of mean, carnivorous creatures.
Barada