After 150h I'd say there's a good game buried underneath the plethora of bugs. I've been playing PDX games for years, and I don't think I ever played a game so awfully and thoroughly bugged in my life. As of now there are more bugs in the pre-game menus (I counted 7) than the pseudo-campaign has missions (literally five).
Virtually each and every aspect of the game has something broken, and for reasons unknown Triumph has been super slow to release patches to even the most obvious, blatant and game braking issues to the point the two hotfixes only solve some crashes, and even now, month after the release they've only just announced a patch is coming. Such approach, oblivious to player retention has seen the numbers on steam drop from 40k to 10k already.
That said, after a good deal of time spent in the editors trying to fix the most annoying shit myself, it's rather obvious majority of the bugs stem from wrongly set values in their labyrinthine, registry-like system. Something that potentially could be fixed, should they decide to spend enough time to actually acknowledge and gradually fix all stuff people report.
If stuff worked as the (disassociated from actual values) text descriptions say, there's a good deal of solid systems at work in the game. Most of all, the customization through race traits (even if visuals are purely cosmetic), culture (unit roosters & abilities), topped with social traits and lastly tome selection (and availability for T4 & T5) really allows some good mix & match buildcraft. From there, rest of the game plays out quite different given those empire choices, and I can see a high potential for random generated map replayability.
As for more systemic issues, firstly
AI has major advantages, even on lowest difficulties but thankfully there are already mods to somewhat remedy that.
Secondly diplomacy is fucked, as AIs do stupid shit according to their "personality" like in Civ6. Meant to make diplomacy better with players acting according to actual events with casus belli and what not, but effectively I've mostly seen them hoard doomstacks of armies and rarely fight each other.
Third, the magic victory is just piss poor an unsatisfactory. Despite locations of final structures being telegraphed to all players like nukes in Civ, the AI is so unable to react, the base game mechanic just spawns some random armies around them in the last few turns.
Next, there's an issue with game time padding. While build and research speeds are configurable, the default pacing makes reaching T5 tome below turn 100 rather standard and as such, even in campaign, late game becomes a bloat of super units rolling 5+ powerful enchantments each.
Lastly, the campaign just plainly sucks. Instead of a set of missions, there are 5 "story realms", semi-generated maps with preset, mostly annoying, features. Thankfully it's possible to create a custom faction for every one of them:
- Valley of Wonders - tripe tutorial level
- Enchanted Archipelago - island map yay!; since most sea enemies are now embarked land units, I beaten it without building a single dedicated naval unit
- Crimson Caldera - defeat AIs through heavily scripted quests, probably the most in line with older games, but the map has the super annoying "effect" where all units have a huge chance to go berserk in turn 3 of every battle, virtually fucking up all planning, so just autoresolve everything
- The Eternal Court - supposedly diplomacy focused map, but as mentioned, diplomacy is fucked, so just ally Meandor (yes the same one) and wait until he wins an allied Magic victory with the 3 OP cities he starts with. Oh, and this time the map effect gets all units resurrected in battle after first kill. Joy.
- Grexolis - an utter clusterfuck, supposedly a player + 4v4 AI map, but the allied AIs mostly keep to themselves, while player has to deal with the major enemy starting with 3 cities and rolling 5-6 doomstacks around turn 30. There are some bullshit effects for enemies and some for allies, but I don't exactly remember them. Just hold out for own Magic victory. Boring.
To sum it up - a promising game for custom generated maps, through sheer amount of faction customization possible, should they take the time to fix all the bugs; but as of now a buggy mess with a short, boring campaign.