D4's story is top notch in terms of really utilizing their unique writing skills to the fullest. It's humor is a lot less forced (than 3, I'm playing it now) and actually made me laugh quite a few times, which is very rare for me (not laughing in general, but actually enjoying weird Japanese humor like this). The genuine comedy of the game is a gem of it's crown, but I'd say the other jewels would be the new graphics updates are very well done. However, if you prefer the old school sprites you can switch back at any time. The characters in 4 are well done, with a good amount of versatility among the character cast and the beginning is especially way more involving straight from the get go than 3 was without a fucking doubt. D4 had me laughing 15 minutes into the game while also enjoying the actual game play, so that's a win/win combination for me.