Good IVs or bad IVs, i just raise pokemons now. Sure, sometimes i still breed them for a move, but that's it.
I've decided to take Tamer's logic and treat Pokemons as living beings, and not tools. I didn't copy the signature thing though, have to do it.
But going with what Gutten said: Natures can be changed nowadays, so what's going to matter for the "perfect" pokemon is it's IVs.