While they're an interesting idea, it still amounts to another ninja nerf because these are not available until 1 CP.  In most games you'll need your core infantry before then, at least in 4v4.  Maybe they're a better unit in 1v1.  If these are 1 CP, Assault Grens should be also.
There is no ninja nerf.
Raid section where CP 1 from that start:
"Raid Section
    1 CP; Starts as a 5 Man squad. Does not get the received accuracy cover bonus of regular infantry sections, but also does not get the weapon penalties when fighting out of cover. Captures/decapatures points 33% faster over normal sections. Builds items 50% slower.
    Can be upgraded with a Vickers K LMG. Has access to Fast-Throwing Molotovs and Sprint abilities.    "
They also have little to do with assault grens or assualt IS that is.