There are so many Ancients rules sets around that I think it is a major deterrent to anyone starting out to actually game this period. I started when God was a lad (OK, maybe in his late teens) with WRG 6th Edition and, though I never mastered them, at least cut my teeth with them. They were my first real rules, not ones I had copied out of a book (I didn't know it was illegal then! I was only a kid!!!), but I so savoured that first win - I used someone's Seleucids against a Trajanic Roman army in a club competition and fielded all the wierd stuff. I can still remember my scythed chariots crashing into a legion and an auxiliary cohort and then rolling +4. 101 casualties I believe, and two routing Roman units....
Then, after a short hiatus when we all decided we hated WRG 7th, came the DBA/ DBM sets. They took off in a big way, but, looking back, left no sense of feeling, just that you had taken part in at best a chess game and at worst some sort of mathemetical experiment.
Then came WAB. Quirky, sometimes downright odd, often frustrating, but accessible, familiar, colourful, with a few sample army lists to get you going and I was back in the room (so long as a strict recreation of history was not what was required). They are still my favourite set, especially in their latest incarnation, warts and all. I have sniffed at Crusader, passed up Impetus and Warmaster and left Clash of Empires in my lunchbox so far, should I get peckish, but WAB still comes out top of my ancients menu.
I can live with the quirks and go with the fun. Thus, my Indians and my Medievals are all based to WAB and I am unashamed to say I am a WABBER (or whatever they call themselves in polite society).