Racial wise is probably something like
Undead continues to be OP.
https://tbc.wowhead.com/spell=20549/war-stomp is probably most BiS in entire WSG, use it when flag carrier is about to die and its like 100% chance you will grab the flag from everyone... or just use it to get a 100% chance of slowing anyone with hamstring/wing clip etc
Gnome racial gets improved, no cast-time in TBC, but longer cd however. From
https://classic.wowhead.com/spell=20589/escape-artist to
https://tbc.wowhead.com/spell=20589/escape-artist
Blood elves
https://tbc.wowhead.com/spell=822/magic-resistance , mana tap and silence + energy/mana gain are all great traits
Orcs resist chance to stuns get nerfed, but their berserk gets improved if you're, adds spell damage and attack power if you're a shaman -
https://tbc.wowhead.com/spell=33697/blood-fury
Dwarves racial has been OP from vanilla to shadowlands, only tricky part is to know when to use it.
Troll racial is a really, really powerful burst. I think hunters, priests, mages and ele shamans gets most benefit from it
Draenei's healing is not as OP as it is in wotlk
https://tbc.wowhead.com/spell=28880/gift-of-the-naaru has cast time and doesn't seem to scale with attack power etc - but they can give their entire group either
https://tbc.wowhead.com/spell=28878/inspiring-presence or
https://tbc.wowhead.com/spell=6562/heroic-presence ... doesn't give an OP difference, but it does contribute to you and your team
Human racial is great counter to stealthies, obviously. Can be useful in arenas. I personally love combining
https://tbc.wowhead.com/spell=20600/perception with
https://tbc.wowhead.com/item=10501/catseye-ultra-goggles in higher brackets -
https://tbc.wowhead.com/spell=20598/the-human-spirit will get increased from 5% to 10%
Night elves.. they say you can use
https://tbc.wowhead.com/spell=20580/shadowmeld#comments in combat in TBC, but why on earth would it still be 10 sec CD? Would be incredibly abused. I don't think it will apply? I personally prefer to be night elf on a rogue in 19s because of the high dodge chance the class has at such a low level.
https://tbc.wowhead.com/spell=20582/quickness gives an entire percentage more, then
https://tbc.wowhead.com/spell=20583/nature-resistance is nice to have against
https://tbc.wowhead.com/spell=16810/natures-grasp and
https://tbc.wowhead.com/spell=2484/earthbind-totem - it resist somewhat often with
https://classic.wowhead.com/spell=20014/enchant-cloak-greater-resistance !
Of course!