Well, yeah, Leon and Soma (Soma actually did have the most out of all the handhelds, BTW) pretty much blow the rest of the cast away when it comes to character development. Also, Jonathan actually grows up in his story.
Your comment reminded me of Kira Yamato of Gundam SEED, BTW. Not only does that comment ring true for him, it's the polite version. He's got Plothax armor AND Instahit weapons, nevermind the fact that Simon got more development than him in the original Castlevania. Really, compared to that, Jonathan here is a literary masterpiece.
Note that this is a comparison. Jonathan's script still blew. It just wasn't as bad as SEED.
*/Obligatory outside source comparison. ibn4flames*