For me Fire is an excellent spec for raiding when all the rest of you party wants is eyebrow singeing raw fire power.

So yes Arcane mages might seem the best but they are not in raids that's for sure.

I'm sure somebody might disagree.

If I PvP'd a lot more I would have a heavy frost build with some arcane obviously to survive longer.

You cant say arcane mages are crap, cause t5 gear is for arcane... Arcane is great once you get enough spell damage and mana otherwise your gonna have problems. Fire is good all around, great for pve and pretty decent at pvp. Frost really is only good for pvp it doesnt put out damage in pve like any other spec. But if your like me and dont mind putting 100g a week switching specs than have fun and see what you like.