Ancient Empires isn't much like Armati or Tactica. To summarize what I've mentioned before:

Strengths include excellent OBs for a number of ancient battles, a small-scale tactical representation that goes all the way to the manipular level, and an overall focus on purely historical engagements within a limited range. Each module is really designed to handle a single period in depth. Also a strength is that the system is designed for multiplayer from the outset.

Weaknesses include a unique basing system (although WRG standard basing can be used) and the sheer number of figures required to fight these battles. I think Alexander's army at the Hydaspes requires over 500 figures, with Porus' army at over 700, and that's not a large battle. Of course, you could field much smaller armies in nonhistorical engagements, but that would undercut some of the strengths of the system. Or you could try 6mm, which might be where these rules could really shine.

I don't know of any groups playing these rules. Doing Ancient Empires up right would require a major commitment from an entire club, and I think most ancients gamers are happier with smaller scale, more "fun" battles. A pity, really, as I think ancients could benefit from some really large scale approaches like this to balance out the DBA mini-armies.