The designs for the 5th gen are getting more creative, and less bland like adding interesting stuff on the designs like more colors, interesting patterns, and other stuff. So no, the visual designs are not lazy. The older generation (like the 1st gen and maybe the 2nd gen) are bland because some (or most?) Pokémon designs are simple like Ditto is just a plain pink blob, Grimer is just a pile of purple sludge and it's evolution Muk, it's just a bigger version of Grimer, only meaner. Voltorb is like a Pokéball with two colors with eyes, and it's evolution Electrode is just a bigger upside-down Pokéball with a face. It's been over like a decade that those older gen Pokémon visual designs haven't been changed (not talking about sprite quality and resolution) to look modern in this day.