I really enjoyed TB mode so far. I'll wait for the beta to end so I don't get burned out though. The extra time each battle takes can be a bit tedious at times, but the level of detail that battles are now fought at is a good throw back to older games like Final Fantasy Tactics, which is a whole ball of wonderful to me.
While it's true some builds are really broken, and some classes have some advantages/disadvantages in this mode, the overall experience is still great. balance will always be hard, I mean, the original game on PotD is meant for 5 people, but can be solo'd or duo'd with the right set up and prep. So balance is always going to be difficult.
Things I'm personally seeing so far that need review:
Black Jacket -- The thing that needs attention here is that the Black Jacket can change weapon sets on OTHER peoples turns. So during the mage's turn you can click over to your Black Jacket and change to the shield set if you forgot to do so on your actual turn. This seems to be an unintended effect.
Druid -Shapeshift/Spiritshift -- If you lose spiritshift or shapeshift while casting another spell, it will INTERRUPT the current spell cast and waste the Druids turn. I don't think this was intended?
Dual Wield vs 2H -- I touch on this below in this post about how aoe is a problem for Melee heavy teams in PotD. The damage reduction of Dual Wield (-35%) is somewhat offset by being able to full attack each round, but it's still a slog to get through even 1 on 1 melee in TB. When my level 5 assassin/devoted saber rogue is only swinging (hits) for ~50 on one target, and my Evoker wizard is using fireball for 50 dmg to 5 targets (not counting the evoker 'double-cast' procs) in the same round, it's hard to not bring a heavy magic team.
Maybe this could be offset by raising the damage of melee and ranged weapons by ~25%? Or somehow reward melee/ranged that has high dexterity/attack speed and/or low initiative.
Armor -- I'm sure you're aware of this, but armor is kind of an issue. There really isn't any downfall to wearing med/heavy armor for the whole team, unless your party build REQUIRES you to go first. Usually, you'll spend your first round buffing/debuffing and letting the enemy get closer to you. And since spells will finish in that round, or first in the next round, there isn't a penalty to bulking up your team in heavy gear. Even when I have a lightly armored mage that goes first in combat, I'll delay their turn so the enemy will move closer and group up.
I love a melee heavy team in the normal mode, but TB mode brought mages back to the forefront for me. Granted they require a lot more protection and strategic placement as the AI is MUCH better in TB mode about interrupts. However I find mages are much more fun to play now.
Circling back to balance, it seems that mages may need a little more tweaking in this department, since they essentially get off 1 spell per round, it is a little difficult to bench a wizard or two that can cast lightning bolt or fireball 3 times in the same time span as an Assassin rogue getting 3 dual wield attacks. I'd love to bring a physical team back into the fold, but it's really difficult to pass up on the insane AoE dps mages can produce in just about the same time span as a melee DPS. Looks like this is mostly due to the changes to Initiative, and recovery time(attack speed). Since you can't focus on stacking attack speed to get as many swings as possible.
Fextralife made a couple interesting points that in TB mode, the focus has shifted from maxing dps in as short a time frame as possible, to more of a crowd control focus (the example they use is Divinity: Original Sin).
Are there any plans to bring Melee back a little bit? Maybe something like 'Action Surge' from DnD that allows the melee classes an extra action on their turn, once per combat, almost like an empower. My main issue currently with bringing a Melee team in PotD is that there isn't really an answer for swarms of mobs, Barbarian + Mob stance isn't enough especially with the higher armor and deflection of PotD.
Anyways, just my two thoughts. I'm really liking TB mode, and look forward to your adjustments once it leaves Beta.
Thanks folks