Does the Otter Pokémon look like Buizel, though? No, not really. Does the Pig Pokémon look anything like Spoink or Grumpig? No. In the animal kingdom there are plenty of different types of each species of animal, so the same can apply to the Pokémon world, surely? Especially when all the "duplicates" look wildly different. Just because there are similarities between them (all birds have wings, that doesn't make them the same, they're all very different) doesn't mean they are in any way "unoriginal".
You're entitled to your opinion on how they look (personally I really like the grass snake, but I can understand the idea that it looks strange), but calling them unoriginal is falsehood. They're original, or at the most have minor overlap with other previous Pokémon. I think you're exaggerating how unoriginal they are, personally.