I agree that this update is a massive improvement, especially in the balancing department. Personally wished that more hybrids/superhybrids inherited or kept the lineage-unique abilities of their parents though (e.g. Erlikospyx and Debilitating Distraction, Alloraptor and Cleansing Shattering Strike, Tryostronix and Group Takedown), and I kind of dislike how hadrosaur hybrids became much harder or even basically impossible to use in single-player PvP, but overall the update is pretty good.
At the same time, I think in many previous updates, there were lots of balancing issues where creatures which were easier to create (e.g. Indominus G2, Procerathomimus) were more powerful than creatures which were harder to create, combined with some creatures which dominated the arena. If people genuinely feel that the arena is unbalanced, I think they’re right to discuss and provide reasons for why they think the arena is unbalanced and how it should be fixed. That doesn’t mean Ludia should take their word for it though, but it does mean that such complaints, especially in sufficient numbers, should be taken that something’s off with the balancing.
(Having said all that, there are definitely lots of people salty that their particular overpowered creature was nerfed)
TL;DR: Update 2.0 has definitely fixed a lot of the issues with battle balancing, but previous updates had lots of balance/power-resource curve issues which imho people were right to complain about.