I have been using AG in 1v1 with a lot of success (I am currently unranked so I might just be facing noobs, but the people I have fought don't have low levels and play decently). I only build one and really what I find is that it gives incredible early game capping power. Yes late game they suffer in head on fights with other infantry, but what I find them good for is flanking support teams when my front line is engaged and going after those pesky Engies and RE that cap behind the lines.
The early game boost of getting an instant assault unit is significant and catches a lot of players off-guard.
