As far as a Weezing evolution goes, I don't see how they could make it thematically similar to it without making it look like some kind of tumor.
Whats the problem with single stand alone Pokemon with good stats? I was, and am, a big fan of the original Magmar/Jynx/Scyther/Tauros etc. All Pokemon who had good stats for generation 1. I don't understand why everything has to get an evolution. GF always fuck it up anyway, and end up just creating exaggerated, fatter versions of the pre-evolutions.
I don't know if "fatter" is the right word... besides, Magmar looks incredibly dumb. A butt-head and those weird scales on his arms just don't sit with me. Magmortar looks like the cool salamander/duck thing he was supposed to be. On top of that, everyone has their own opinions. There will always be fans claiming one generation was better than the other simply because of their experiences with that generation. I never really liked Jynx anyways, but I think players want evolutions for Pokemon to make them competitively viable. They are also pretty solid designs to improve upon, rather than resorting to making additional forms for Pokemon like Rotom, or even worthless shit like Bonsly.