TBH, here's why I think Vasari are weak.
The Scout doesn't fight off Illums well. I mean, you can, but you need more than the 2 to 1 Scout to Illum ratio, which doesn't favor Vasari.
The skirmisher does 10.5 damage but takes up 7 ship slots, and while it does get reintegration, I don't understand why the ship does 10.5 dps. Cobalts do 9.5 and take up 5 ship slots. Helloooo, this doesn't add up.
The Assailant wasn't nerfed, but what it counters was buffed. One of the biggest strengths of Vasari is the early game tactic of the Egg with Assailants. Well, assailants counter light frigs, and the light frigs got buffed. The counter isn't ridiculous as any more, so I guess I miss the nostalgic genocide of lrf crushing light frigs.
The Egg's nanite disassembler got nerfed. That was the big selling point of this race to me in early game situations.
Also, the Vasari have a very weak colonize now. Instead of Advent being the only race with a good colonize ability, the Vasari are the only race now that doesn't have a good one. I honestly believe the ability should be fixed NOT BY GIVING AN EXTRA CONSTRUCTOR, but by giving a free turret, then 2 free turrets, and then 2 free turrets and a repair bay. Something along those lines. Why? This would help the Vasari expand quicker.
Yes the other caps have been buffed, but here's my issue. In online play it's VERY RARE to have a map where you are in such close quarters that NOT picking the colonizer is your best choice. And in that situation you want the strongest light frig/scout/long range frig. In my mind, Vasari is hosed on all accounts compared to other races.
Are they god awful? Of course not. Are they great? It's in the eye of the beholder. I just see more allure in the other races right now, and really, it comes down to the fact that the caps get great colonizing bonuses.