I feel like part of the reason people get disappointed or hateful of certain characters is because they limit themselves to certain types, and also misinterpret certain characters too.
The two types that seem so commonly requested are badass/beastly looking characters (Ridley, Black Shadow, Magnus etc), that fit in with characters like Fox, Falco, Samus, etc. Because those guys look like they are more for an older, testosterone fueled crowd.
The other type is "iconic/old" characters (Pac-Man, Toad, Daisy, etc, are the sort of characters that were requested for pretty much this reason, and nothing else).
And personally I hate that mindset, because characters shouldn't get a free pass because they look cool and intimidating, or they are simply well-known.
I also find asking for characters because they look intimidating or badass to be hilariously ironic because half of the time, those characters would lose to the "babyish" or "too cutesy" characters.
I mean, call Rosalina "uuuggh shes just a wimpy little Blue Peach" all you want, but:
Don't try and tell me she ain't badass enough to be in Smash, she would absolutely obliterate Ridley with her canon abilities (even if he is "too big"
).
I could say the same about Palutena too, and just in general, I think the phrase "never judge a book by it's cover" applies really well to Smash.