Well,
had my first look at the Gaim today - 5 point Raid ACTA vs the Shadow 1 young one / 1 scout combo. The Gaim were not maxed to take out shadows: 1 Assault Ship, 2 Carriers, 1 Raid Queen, 2 Skirmish Queens.
The Shadow Scout hovered on the base edge and took no part in the fight. The Shadow Young One Went steaming up the middle, and only put 6 damage on the Raid lvl Queen. The Gaim then converted their fighters to missiles. Attacking with 16 of these missiles the Young One had its weapons knocked off line - bad news, and the damage racked up towards the 30 mark. The young one had to run and heal up for a turn - outstripping the fighters, but damage snuck up to around the 35 mark. Then it turned, put 18 damage on a carrier, but with 12 missiles attacking, the damage crept up to mid forties.
The Young one then took out a skirmish queen, and again massed missiles and emines pushed the damage into the fifties.
Then the damaged carrier went, the missiles kept hitting and damage crept past 60, but now there was a lot less fire the young one would have to experience, and indeed with the missiles running out and three ships left the critical stage was past and the Gaim could never put the damage down to stop the Young One healing up.
I was allowing 12 to 16 missiles to attack a go - which might be slightly generous, but I wanted to favour the Gaim. It confirmed what I suspected, there is a nasty period when the Shadow is surrounded and 3 to 4 precise DD hits a go, plus emines and beams - but once 2 or 3 of the Gaim ships have gone, then the Young One can cope with the damage the Gaim can dish out.
Seeing that number of fighters on the ground is daunting, and I can see them giving my standard configuration Centaurii and League fleets a hard time, but I reckon the Shadows to be very strong at Raid - more so than at higher levels where combined fire can take them down very fast.