The problem is that the stun only lasts one round (it's a range 7 attack with a very high chance to proc) the idea is that the bulwark can lock down a target while its friends tear it to bits. At the end of the day, you have:
Bulwark - Ranged support unit, specializing in locking down areas with overwatch against lots of targets while relying on other units to screen it from damage,
Lancer - High speed unit, specializing in doing a lot of damage to a single target.
In a one of one fight, the lancer is just holding all the cards. Even if I were to give the bulwark +5hp and +1 armor, while the lancer gets -1 shields and -10hp, the Lancer would probably still win just because of how it's designed. Letting the stun on concussive shot last 2 turns would certainly fix it, but that would be extremely powerful, so it might just cause balance issues elsewhere.
The lancer beats everything because, in the end, single target damage is all it has. The other units have all sorts of tactical gimmicks and options. Lancers pretty much just kill things.
With the bulwark, you have a slowly advancing line of Dvar with shields, shotguns, and grenade launchers. The bulwark stands behind giving them cover. In a Dvar vs Amazon battle, a clever Dvar player would spam explosives to stagger the lancers to hold them in place, while the bulwark shoots them to death from a distance.
The lancer seems to be both a swift skirmishing cavalry AND a heavy shock cavalry combined into a tier 2;.
True! It's quite possible we'll need to nerf one (or both) of those roles depending on how balance goes. Right now, the skirmisher aspect is irrelevent here though, the Lacner wins by just charging forwards and using melee. No subtlety required!
Does attacking trigger Overwatch? I mean, if a Bulwark is surrounded by 3 enemy Hidden at close range, would it make sense to set the Bullie on Overwatch to take a shot every time the Hidden try to shoot (not move)? If not, would I be correct in assuming there is a Return Fire ability on someone or on some mods?
Attacking does trigger overwatch, but teleporting triggers overwatch at the destination you teleport to (i.e. if you teleport into overwatch you will get shot at, but you can safely teleport out of it) So the hidden could teleport to safety. I don't think a hidden can take a bulwark on its own though, unless it gets some very lucky rolls.
Lancer - probably in the Lancer's favor. Neither have ranged overwatch, and both have the same ranged damage and frontal defenses, but once the Lancer reaches melee(probably possible, despite losing an action and being pushed back, but not definite), it can deal more per round in melee, and the Assault Bike may need to disengage in order to perform it's focused laser again. Disengaging forcing it to take both Exposed Flanks and the Lancer's empowered flanking attack for a heavy hit. Presuming the cone aoe has a cooldown, and would only be able to be used on the first round it is engaged in melee.
I tried it. It's close, but the lancer has the edge due to melee overwatch. It can charge the bike, then strike it when the bike tries to move away. I thought the bike might be able to win by kiting and using focused blasts to keep pushing the lancer away, but the lancer always ends up just close enough to do a melee charge.