What classes do you rank up to seargents and the one lieutenant.

[GamerTorres]

I personally went with 2 soldiers and a hunter. Still haven't completed the game but I hope I won't regret ranking them up. Kinda thought ranking the doctor up to a seargent so he can heal more but didn't think it would be necessarily worth it!

[Lusandar]

Hunters benefit the most from ranking up, Soldiers the least. I typically chose Hunter and scouts for the highest ranks.

[GamerTorres]

Soldiers the least? Even over scholars?

[Mauman]

lieutenant hunter - as mentioned hunters benefit the most from it and a a hunter with both point blank shot and walk your shots is something to be feared.

Seargent scout - scouts are one of the best units in the game. High damage, superior movement.

seargent Amazon - unless I can't keep the class (which in that case I might pick the warrior or champion) this is my third pick. She's basically many of the benefits of the scout and hunter put together.

As for soldiers being bad, I wouldn't say that. It's just that many missions have time limits which rather hurt soldier viability.

[Lusandar]

I played 2 campaigns on insane and soldiers just don't have enough defensive or offensive capabilities to be relied upon. It's useful to have one for their stun but not much else since you simply can't tank hits for long at that difficulty regardless of armor. They are also dreadful on timed missions as has been stated with their low mobility and damage output.

You need to kill enemies rather than wound them at that level to survive so you need to know and set up comboes to kill as many as possible when they get close: Hunter+doctor will kill anything, 2 scouts will kill anything, or scout+ ranged hunter (when it's not possible to point blank), etc.

scout+soldier works at first but not in the late game and the soldier just don't compliment well with anyone later in the game when everyone has some form of armor since he can't regularly go past 40 damage per turn. They remain useful to prevent that one enemy you couldn't kill from hitting you next turn with their stun but that's about it and the champion is just better once you can recruit him.

Can't really comment on scholars out in the field, I never really bothered with them