I found Tactics Maiden Remastered.
It comes from a long line of mobile tactical games and i can feel the disgust already but according to the fanboys, mechanism improved gradually and the dev released this on on PC.
Graphics aren't fantastic but are serviceable, i find them just fine.
The engine is good, everything is fast, you're not going to stare at a loading screen for half an hour either.
The UI is good, you'll need some practice to get used to the right click and left click though.
Character dev is good, you get some skill points each level up (only got to level 3 seems like it's +2 every level and +1 on level 1) but skills and classes are quite good and really unique (arcane archer, a kind of valkyrie, a lot of different rogues and assassins, a mage with life drain incremently increasing his max HP over and over again for the duration of the combat ...)
Encounter design is alright, it's not two blocks facing each other, could be better but could be way worse.
Each mission has a classic mode or an epic one, you get the choice on every mission start.
Combat is actually interesting and tough, some mission variety, like an escort one where the merchant you escort just follows the road at a regular pace so he's easy to follow and protect.
Half the combat are about capturing tents and towers though, tents allow you to spawn units up to the map limit, towers add +1 to that limit, it's a bit tiring but it's not bad once you get used to it, also, units act as soon as they're spawned so, if you crush the enemy but he still has a tent, brace yourself for the shitstorm.
I prefer the few missions without tents and tower mechanism but even with them, it's alright, really, it's way better than most recent AAA games.
Edit: Actually, you really get used to deal with the constant reinforcements and adapt your strategy to stay out of harm's way until you can capture a tent, secure the area and then move on to the next target, be it another tent or a pillar.
Here's my Warlock:
Going to the capital city in order to plead his cause before the Queen, i just saved a boar attacked by wolves, giant spiders and a couple of bears and now, i can recruit him: