Every time he started a fight and his subtitles read, "You're in my way," my ears always hear him say "Your mother." Nothing gets me more fired up for a fight than a jab thrown at yo momma.
On the contrary. He's even harder to use in DOA5. His moveset was much better in DOA2 and DOA3. But around DOA4 and DOA5, his moveset got stiffer when they removed some of Leon's moves and gave them to Bayman.
Leon was very difficult to use. But damn, if mastered he has some of the coolest bone breaking moves. I personally preferred bass because the wrestling moves looked cool