Advantages of Mages over other races.

No matter how much I play, I always have enough resources! Besides, we usually play in the late game (I probably forgot to mention that). There's also a perk that increases the number of resources found; if you're short, take it. And Titans are pretty good in melee combat! Mages have magic, and Goblins have the ability to heal or destroy vehicles! There's always an alternative!

Added after 3 minutes
But I'm still amazed by Gargoyles! They're just impenetrable! We played against a Human player who had twice as many troops as I did, and I blocked his archers with Gargoyles. No matter how much he attacked, in the end, I still had 1,000 units left (out of 1,000+).