iMelllo has a good point.
I remember making a topic similiar to this "Lion-sized Warrior Cats?" Whenever I make my warrior characters, I make them slightly bigger than the mid-sized option. They are pretty much they same size as my red fox characters. The only "big" character I have is the Jason Voorhees pitbull. Howerver, he is not at full max height, since most pitbulls aren't that big. He is a bit smaller than the max height.
The only thing I don't like about the whole oversized thing is when people abuse the big size to win their battles unrealistically. For example, I have met a few warriors who were bigger than my fox or my bobcat character and they would tell me "I'm bigger and more powerful than you! I can kill you with just a swipe of my paw to your head." That's too unrealistic, and that's when I have a problem with the oversizing. However, if I meet a warrior that is bigger than my fox or bobcat character, and they play in terms of being realistic and fair (not using their height as an excuse to win against me) then I'm okay with it.