I wrote a review of Mexica (in Finnish). I also created a Finnish piecepack page, which gives some basic information about piecepack, lists the games I’ve tried and has some links.
Mexica is part of the mask-trilogy (other games in the trilogy are Tikal and Java) and a rather good part, too. Actually, I think it might the best of them. I haven’t played Java a lot, though.
Anyway, Mexica blends action points and area control in a fine way. The resulting game is fairly easy, plays fast (each turn players have only six points, so there’s less analysis) and is over fairly quickly (with players fast enough, the game takes just an hour or even less). It looks gorgeous (it’s a Vohwinkel job, after all), even though everybody doesn’t like the plastic pyramids. I do.