It is eminently more playable than 1.13 (by which I mean, getting it running is not a chore, it handles 1440p+ resolutions just fine, the UI is actually usable, etc) but a step backwards in terms of actual game design imo. I'm still waiting for someone to give JA2 the "XCOM -> Xenonauts" treatment -- just port the systems and gameplay over but modernize the UI and make it run as expected on new machines; JA3 isn't JA2 and it's not even trying to be.
With that said, I have been enjoying my time with JA3 so far. It's been a while since I've played a recent tactics game (probably Phoenix Point was the last one? Maybe Phantom Brigade?) and it's competent though not exceptional. I like it more than Phoenix Point at any rate.
I have some minor complaints: the maps are too small, the weapon variety isn't great, sometimes it's not clear when the landscape/obstacles are going to obstruct your shots, stealth is either massively OP (if you're save scumming) or just unreliable enough to be extremely risky if you're not, etc. I haven't noticed any serious time pressure, either -- it seems like there's nothing stopping you from taking a mine and then just holing up and spending a while training your mercs up, maxing out militia, all that stuff. If the enemy strength is ramping up I haven't noticed it: my reaction to attacks is, "wow, free loot!". I'm playing on the middle difficulty, so maybe the hardest is a different story there. It's fun setting up ambushes, or picking apart groups of enemies at long-range with a few silenced sniper rifles. At $34.99 (that was the launch sale I think?) it's probably worth it if you like tactics games? I wouldn't pay $60 for it, but it seems like 20-30 hours of decent fun.