[Endoperez]

Yeah, there are many strategies that the AI can't counter. Because multiplayer mostly revolves around these strategies, AI isn't a challenge if you use something meant to have a chance against other players. You'll get beaten by the AI a lot until you can figure out some effective counters against the AI hordes. If you start by reading advanced guides on how to beat the AI, the period where the AI is able to challenge you will be much shorter, of course.