Yep, Spain is tough at first, but if you survive the original onslaught of the Julii, it gets much easier due to its location on the map. I am playing a fun campaign as Spain and have written about my experience in the guides section.

Strange to find Numidia among the 'weaklings'. From my experience from three campaigns (never as them), they always do well under the AI. Plus, there are some rebel cities you can take control of pretty quickly.