No my friend, they put the Sony characters in a very good light. And the Nintendo and Leanbox ones. Hell, the Conquest ending bit into the Planeptune ones.
I think the problem is that, well, Uni IS a decent person but well, they forced the tsundere archetype way too much. Do they really have to make her say that she didn't need help when you revive her for example? Does she have to say "I-it's not like" every other sentence?
And to say that she isn't decent? Hardly. Her side events with Noire really make you wonder what could've happened if:
A. She was more "dere" (adorable/nice side)
B. If she wasn't a tsundere (because really?)
Bottom line, Uni isn't the worst, but she could be better.
It's debatable, while I agree the light is better in mk2, I still think there is room for improvement though, I'm pleased you think Uni is decent like me, it's a shame some people don't understand Uni like us, I mean she's not a brat, she's not bad or anything, I just think she's misunderstood.
It's just that as you said and I agree with you they forced the tsundere way too much, personally they need to get rid of it or at least only show the dere side because that is what lets Noire and Uni down.
Why were they tsunderes to begin with, or is it because of that rule I don't get of: Black pigtails= Tsundere, yes black goes with pigtails and they have black hair to go with the Playstation. But why does that mean they have to be tsunderes. I really think their personality needs to change (I'll publish a topic on this).