I say stupid basic ideas from stupid basic people, they don’t seem to grasp anything about the game in TBC.
First of all, you should make a search on the internet/youtube about it, because its very hard to deeply go into it here.
The answer to your question is: mage is still good in TBC. They are monsters in pvp and is part of some of the absolute top team compositions like RMP/RMD etc. (frost spec) Very high skill ceiling tho
For PvE : in dungeons mages are arguably the best dps class you can bring by a huge margin because of their CC, good aoe and good overall damage without needing anyone elses buffs to perform (self-reliance).
In raids, pre-tier5 you need to go fire because tier 5 2-set bonus changes the whole thing. Mages do around 10-12% less dps than warlocks pre tier 5.
After you get 2 pieces of tier 5, arcane becomes the clear go-to spec for raiding. And it does a lot of damage. Actually, it does MORE damage than warlocks for short, bursty fights, but it has a downside, you get oom quickly. So you need a shadow priest, a lot of mana pots and whatever consumable there is to keep your mana healthy. It’s kinda fun as well because your mana bar is like a mini-game in itself.
Now, since we have seen how short every fight has become in classic compared to before, if that happens in TBC and we start blasting through raids, arcane might even be the top tier dps class since mana will not be an issue in short fights.
Final note: The margin between S-tier and lower tier dps classes in TBC isn’t that big like vanilla, and its negligible. On top of that, mage isn’t a F tier dps anyway, it comes as the 3rd best dps after hunters and warlocks and 2nd best caster dps. So the dps gap is small. Every raid needs AT LEAST 1 mage anyway for buffs and food/water and preferably 2 because you can spell steal some buffs from trash packs mobs/bosses which make things a lot easier.
So having 2 mages in an ideal raid composition is very common, where as having 3+1 warlocks is also the general meta. So having 2 of one class and 3 of another shouldn’t be called that the former is useless but you know, they gotta exaggerate and be super hyperbolic about everything to keep the hype up in those meta videos.
So, all in all, mage is A tier in PVP, S tier in dungeons, A tier in raids and a lot of fun.
However if people think that it sucks and they all reroll warlocks I will be extremely happy to get all the gear for myself.
sign: an old orc fury warrior that played in top guilds in tbc and topped meters, playing a cuddly gnome nowdaiz.