After a day of playing and reading the forums, I think the only unique observation I might have is that it is very unclear how XP is awarded. For example:
My vehicle driver got 0 xp after doing major damage to and killing many creatures. I understand that awarding full XP to a driver may not be right since the kill / damage potential of the vehicle is many times that of dismounts, but he still deserves some. Speaking as a former mechanized engineer soldier, I can say that drivers do learn from encounters and from performing vehicle repairs, and I’d like to see that reflected in game.
Healing / Fixing / Getting partial kills seems to award no SP. This is straight bogus and reflects an “action movie” attitude. In reality the mechanics and medics who have to move and work under fire get quite crafty and good at it, and this experience should be reflected in game. If it is not, it will lead to firaXCOM’s 1’s rapid levelling of classes who get kill shots and slow levelling of classes that make it possible to get kill shots.
Lack of defensive / utility perks in progression. Almost all the perks seem focused on improving the character’s offense, with none on defense. If I want to build a character who is stealthy or resistant to enemy fire, I have no perk options.