So, my thoughts after actually playing with it tonight. It's not quite as bad as I thought... but it's still pretty darned bad. Controllers are nerfed so as a class, they all just got a ton weaker, between the Gambit nerf (again, PLEASE re-add stacking of Investment 1 at level 2, as in the unmodded version) and the Abin Sur's/Deadshot's nerf. I see you made Harley's default modset a Marksman modset... you may as well just re-label her like you did Robin. She's actually buffed as a marksman, but her core build has been destroyed as a controller, after nerfs 4 patches in a row.
ArcGL I haven't tried yet, but considering the numbers, and the difficulty of keeping him alive to keep those stacks, he's probably unplayably bad. He was already in a bad place due to previous nerfs, like Harley as a Controller, due to the same item nerfs, and in addition a huge nerf to his ulti.
Night Supes actually kind of needed the nerf, honestly. He was getting a little OP. However, the thing that is the biggest problem for Controllers is that Controllers as a whole got nerfed, while every Enforcer but Ivy got a buff. What do I mean by that? Ruby of Life being viable on Health-stacking supports. It has made, for example, Mecha Supes probably top-tier. In the new meta, I actually suspect him to be the strongest support, even eclipsing API. It probably helps Robin a lot as well, and with the Lobo's Chain new mod (which is awesome, BTW) it actually puts him in a better place. All in all, this update will REALLY shake the meta, and make playing Support pretty much mean playing Enforcers at the high-end of the game... which at least keeps the game playable, but I really liked the large number of viable champs in the Support role... and a few of them just got nerfed into being unviable.