I played De Bellis Antiquitatis for the first time today! I'd say it's about time. My opponent hasn't played it either so I bet we fell into every rules pitfall in the book in addition to using my hoplite figures which are based for the wrong depth for DBA. I had plenty enough of figures to field two early hoplite greek lists. We had time for two games as the first one ended abruptly.
Apparently it's a bad idea to march your general on horseback into rough terrain. They.. die if they have to retreat at all and that's a sudden death victory right there.
In the second game we got some proper fighting going on. Movement feels a bit fiddly compared to modern games. Melee involves a lot of to-and-fro pushing of stands whilst there are a bare minimum of modifiers to consider. The game proceeds quickly and I bet you can easily play a game to its conclusion in 30-45 minutes.
Based on this experience I'd rate DBA a light "filler" wargame but I'm sure the DBx vets will disagree.