Dominions is a very complicated game and, as such, not easy to write AI for. As a result, to a veteran player the AI is quite weak. BUT, the question here is how long it will take you to get to that point. And whether you will enjoy the process of discovering all the powers that dominions has to offer. Only you can judge that.
That said, if you master solo play, there is always multi-player waiting for you. And THAT will challenge you for the forseeable future
