Like lina said, Aoko's 3c isn't really good anti-air. However, it is good for clipping people who are starting to jump. So while it won't stuff jump-ins, it will punish people who like to jump after blockstrings, after blocking orbs, after backdashing, etc.
On another note, poor Warakia really has the shit piled on him. Remember, despite his crap tier reputation, Shonen using Warakia in SBO 2006 got pretty far. It could be that if more people actually bothered to use him at all, he'd be higher up in the tier list. Just off the top of my head, I'll list a few of his good points:
1) Top-tier dash. Although it doesn't have Ciel's ZOMG clash frames, it covers ground and keeps him low to the ground.
2) Range. Sure in MBAC zoning isn't as useful in general, but it never hurt. Warakia, I will argue, has more tools than average to avoid being rush down. His crappy initial HP puts him at a disadvantage early, but Warakia really shines in end-game when both sides have low HP and are just looking to get that last poke or combo in.
3) One of the best DP in the game. Warakia's 623c is a wonderful thing. It comes out fast and comes out straight above him. I've caught a lot of jump happy players just by doing dash --> 623C. Works really well against ring-spamming Warcs.
4) Decent oki. Granted, VSion's shadows make Warakia's look retarded. But as a whole, Warakia's shadows aren't terrible. Nero blocks people from jumping. Nanaya blocks people from backdashing. And Akiha is an overhead. A slow overhead, but an overhead nonetheless.
5) Overall, the basic gameplan of Warakia is to play keepaway until you can use his high mobility to grind out a combo. It's not the most top tier strategy, but Warakia can do it well. He has shadows, tornadoes, long normals, etc that keep the other player at a distance, a situation where Warakia does best. He can do respectable damage with meter and can grind down the clock if he wants to. His biggest flaw is that once the opponent gets close, he has a difficult time pushing back. But then again, a lot of characters don't deal with rush down well.