Well tbh, GI have already enough tools in their box. I think there is no need to majorly buff their cards, other factions *cough* DoD *cough* need it more desperately. But I do agree on defensive perimeter, that card has so little use it's not even funny. (4 cost deployment, deal once 6 damage to something only in the assault zone for 3? what?)
Its not that GI didnt get good cards, its that other factions got plenty of much more awesome cards and are on par with GI now in plenty of areas. With Thralls, Verore can now get 10/10's exactly as fast as GI with infected drones. Only with Thralls you can place them in assault untransformed and then use mass death, which is incredibly powerfull comparing to one of GI's key advantages - Infected Drones, as i said.
FD now pretty much instantly wins against GI, both because it can easily outmatch the stall of omnitron deck and outplay any regular GI deck due to blocks to cannon cards and above-mentioned bunnybot/defensive perimeter, even if they were at least slightly useful. Exiles were already powerfull thanks to removal/transform abilities that bypass shield. WP has big advantage too thanks to plenty of anti-artifact options(Just comparing, its perfectly fine for WP to have them), and now have a big card to get rid of scouting drones
I agree that DoD needed more cards though, hope they will get more support in the future too.