Depends on difficulty. For Legend better to invest in stats instead of 2-nd class. Also it depends on what they had in 3-rd line (Background perks and weapon proficiancy).

Berserkers adrenaline 1 handed weapons, also adrenaline insanely synergyze with tentacle torso and anu priest ressurection

priest ressurection? How do I get that

引用自 Muton：

priest ressurection? How do I get that

Recruit a priest from Anu Haven or Hire Slug merc from Marketplace. Both of them has this ability at level 7

Or try to get an Anu Priest to join after a haven defense (low chance).

I mean more generally..
What would you make your 2 heavies into?
Your 2 snipers?
Your 2 assaults?
Your berserker into assault or heavy?
Say you have just irrelevant 3rd tier skills like goo immunitty

I look at my teams need. Am I lacking in one area?
In general:
A Heavy with Tunnel Rat is almost guaranteed to get +Infiltrator.
Heavy/Assault for being able to Quick Aim a MG or a missile launcher.
Heavy/Berserker for Ignore Pain.
Heavy/Priest for the psychic capabilities.
Other classes:
Berserker/Infiltrator is dope.

I dont like that brawler and warcry no longer exist

How do you use a berserker / infiltrator and heavy / infiltrator?

Heavy/Infiltrator (with Tunnel Rat): full Infiltrator armor = 90% stealth. No more jet jumping or jetpack control. No more missiles. Scouting at ground level, then artillery (Goliath grenade launcher), flanking shots with MG (or crossbow). When Neural Feedback triggers I have 2 more AP e.g. for a third boom blasted Goliath shot.
Berserker/Infiltrator: built for armor and/or speed (not stealth!). Up to 8 AP with Killer Instinct and Neural Feedback. E.g. Killer Instinct was triggered by Chiron worms. He use dash, then do a melee attack for free (Killer Instinct), dazing the enemy for 2 more AP (either by using Marduk’s Fist or an attack from behind (Surprise Attack) -> another melee attack, then dash back to safety. Or if he is lvl. 7 and I have WP left he may use Adrenaline Rush for even more 1-handed melee attacks (or grenade use). His combat role is to daze enemies not necessarily kill (although he is good at it, too). The killing will be done by his team mates.

Sniper/Technician: Stability for even more accuracy. And a Technician is a must have for Field Medic. So why not on a Sniper.

BTW, Berserker/Infiltrator: Gun Kata for offense (and possibly triggering Neural Feedback), Deploy Decoy, Jamming Field and Parapsychosis for defense.

With Adrenaline Rush he may deploy 4 Spider Drones in a single turn.

what is neural feedback?
i think the spider drones have only 3 so he needs 1 AP to reload

All classes have been reworked (as you already know, e.g. no more Warcry).
Neural Feedback is Infiltrator’s lvl. 5 perk: http://wiki.phoenixpoint.com/Terror_from_the_Void#Infiltrator
You can have Spider Drone ammo in a ready slot = 0 AP to reload. (Or have a RfA Assault nearby. It’s all about teamwork.)

but if I cross class a soldier into infiltrator.. the best abilities are sometimes removed..

For example, if I cross class a tech into assault.. Aimed burst is not available

Class A multi classed to B is not the same as B to A.