Well, I think all subsequent gens are worse than 2, I guess I don't think it's gotten worse every time though. In fact, the opposite, Gen 3 was just much worse than 2, and it's been climbing back up since. Looks like 6 will be a step down again though.
Every generation has bad designs, but c'mon, a lot of the modern ones seem to have more bad designs, or uninspired ones, or ones that just plain don't make sense.
If the word modern wasn't in there, I would think you were referring to Gen 1. A living icicle makes about as much sense as a living rock to me, and living trashbags makes about as much sense as living sludge.
Gen 1 set a precedent for having weird designs, if other gens didn't follow it, it would make things like Voltorb and Magnemite look out of place.