I dunno about re. Root A was such a fucking mess. It had a cool couple fight scenes, and it had the backstory of the old guy, but beyond that, it felt weak and shallow. I'll probably watch it eventually, but it's not something I'm excited for.
As for S2 of OPM, the fact that Madhouse isn't animating it means the animation will almost certainly be worse, but as long as the writing's as good as it was (And since it's based on the same source material, it should be - but delivering a joke in writing and in acting are different things, so we'll see). I never get super-excited for new seasons of anime, honestly, because I feel like they're usually worse than what came before them. Dunno why that is, but it's a trend I've noticed. Not always, but usually.