The people who bash Ice Cream for lack of originality as a way to bash Gen 5 are clearly blind to things like Grimer and Muk, Koffing and Wheezing, Voltorb and Electrode, Diglett and Dugtrio, and Magnemite and Magneton.
Honestly, Vanillite -> Vanillish isn't dumb at all anyway. In fact, the line itself makes sense, small snow cone - Traditional Ice-cream - Double scoop ice cream. The 3rd form is lazy, but not compared to 'Pile of goo -> Bigger pile of goo!'. Klink is worse than Vanillite.
Honestly if you're gonna bash Gen 5 designs for lack of originality, do Thunderus, Landorus and Tornadus. Three almost pallet-swap legends? Yeah.