I'm at the point where I got 3rd squadie (I chose doctor Q)
-Inventory management could be a whole lot better. After enemies on the map have been neutralized player can pick up loot from every container and body, but JA2 did this oh so much better via map screen.
-As far I can tell player can't return to cleared mission map. So you better to remember to mouse over every possible container before leaving.
-Game is very linear. Every mission map of the current act must be done before you can progress to new area
-For some obscure reason game gives you lot different close combat weapons. CS weapons don't deteriorate like armours and firearms.
-Merc quirks seem to be easily manageable so far. For example Grunty will take damage if he gets too excited, but, like for some other Germans, commanding imaginary troops alleviates that risk. Also Vicki's claustrophobia hasn't been a problem yet.
-Levels have gotten bigger and actually have quite nice verticality.
-Though you usually can clear level by sneaking into high ground and sniping foes from there. Some levels add a time limit element so you can't camp too much, but those can be bypassed by killing right enemy unit.
-Some armour and HP bloat starts to be present. Might be worse on higher difficulties (I'm doing normal playthrough now.)
edit.
-Enemy AI seem to be prone of friendly fire incidents and self harm via grenades. On the plus side they can use medical items that they have to cure bleeding so "scratch & hide" -tactics are not always reliable.