I've played three games now in 2.5 and wondered what people think and about some issues in particular.
The three were all Huge galaxies 10 opponents, Genius. In the first as the Slyne I got what i thought was a decent opening but then got attacked from two sides and gave up in disgust. I was impressed by the AI's aggression which was considerably more than previously.
The second Slyne game (I think I discarded a couple of v bad openings in-between) i got another v decent opening and eventually took over completely. I was doing the 2 levels of malevolent (Motivation 1 and 2) and then switching to the bottom line of Benevolent for research and with enough planets this worked fine. The main limiting factor was getting enough Durantium to build cities.
I then tried the Yor and I think they've been made much easier than previously - much too easy?
Going totally Malevolent I was able to take lots of planets and given that I had enough Durantium, growth was trivial and of course morale not an issue. I've just finished on turn 169 and the capital has population 60.5 nearly 3000 ship building and about 1500 apiece science and research.
It was fun it being so easy but I guess that for balance the Yor need reining in a bit. Maybe growth could be made progressively more expensive - probably in terms of Durantium (and other resources?) rather than production. And perhaps even robots can get tense again from overcrowding (as in previous iterations).
The other issue I've noticed is re starbases. I built 22 but lots of the AI are in single figures and it seems that the (now dead) Drengin built 0! This is surely very suboptimal AI behaviour.
Anyway, other people must have other concerns.