Got nothing against Leon. Sure, his hair was silly and he was pale and I would've preferred him to use his sword too, but he was still ok. LoI's story at least gives a personal reason for the Belmonts' crusade against vampires instead of just the usual "he/she's a Belmont. It's what Belmonts do". He was tried, he was tempted, but ultimately he chose to fight instead of succumbing like Mathias (or Gabriel).