Hmm, I think I see what the OP is getting at and thats the idea that the new pokemon somehow seem less related to previous styles of pokemon, be they evo's or completely new species. It's like the point I made about what Charizard would look like if he was created for this new gen instead of for the first.
However, this being the debate forum and all, I'd just like to suggest that maybe a good analogy would be fashion in the eighties. It was cool at the time but style has moved on and some people still find the old styles attractive whilst others (me included) find it pretty awful. Pokemon design has done the same, time has moved on and stylistic cues have changed yet some people prefer old to new or vice-versa.
People who cry foul at the new designs do have to take into account that time separates each gen and will leave an obvious mark.