Less Cool:
Elves in all forms. And Sweet Jesus do they have forms. It's like someone nuked an elven nation and the elves got all warped by the radiation and like roaches in the rubble they just bred and evolved and spread out to feed and nance in the woods.
Orcs. Making them CE has ruined them in my eyes. May they commit ritual suicide and be promptly beaten up by the goblins in Acheron.
Devils: Bone Devils. Chain Devils. Bearded Devils. Horned Devils. Ice Devils. Whoever changed the Baatezu names back to the 1e versions has shamed themselves and is henceforth declared no longer human. Pack your bags nameless designer, we're shooting you into space.
More Cool:
Kobolds. They're so much cooler now. Meepo made them
Githyanki/Githzerai. You cannot make them uncool. It's not possible.
Tanar'ri: They're mocking the Baatezu now for having crappy names.
Yugoloths: Even that Int 16, stat neutered Ultroloth is looking cool compared to the 'devils' and he's laughing at them too.
Pit Fiend: He's still trying to play it cool and he's almost pulling it off despite being like a really cool kid forced to hang out with his brain damaged cousins who drank wood alcohol on a frat dare and trying to ignore them drooling or playing with themselves in public.
