Are huge maps harder?

[Joonie73]

I've only played on the biggest map & I always get slammed. I've tried Jotunheim, Ulm, Arcos, Marignon, Man, Pythium. I am not competitive at all with Ulm or Jotunheim. Marignon and Man works a bit better but not much. Arcos and Pythium Lasts a while but at the end game, I just get overwhelmed with the AI, which seems to bring 500+ unit armies every where on the map and seem to dispel any global spell I cast. It is so frustrating. Are huge maps just harder? Maybe I take too long. I tend to move out very very slow...