The ultimate reason it failed is because they made a shit game, just like almost every failed game.
Success has little to do with quality above a certain market size; whether Tyranny's market is above that size is debatable, but PoE's definitely is. Even then, success and quality aren't that connected.
The art style is not a locus of criticism of Tyranny
2. Historically laughable to a degree hard to believe. Bronze age kingdoms had just a dozen suits of bronze plate and on and on
Other games are historically inaccurate to a similar degree, yet no-one cares; In fact, if a game is too accurate, people may see it as boring. The only designer in the industry who cares somewhat about verisimilitude is Josh Sawyer, who AFAIK wasn't involved in Tyranny.
3. No one heard of anyone involved in the game before.
PoE was like that to people outside the Codex, yet it still sold almost a million. People outside the Codex also buy into the cult of the creator far less.
4. All the marketing talks about is muh inclusive diverseness. Even among people who support that shit, how the fuck is that an actual selling point?
The marketing doesn't mention anything like that whatsoever, and even if it did, most people wouldn't care.
Here's why I think Tyranny failed:
- Lack of marketing; people said that they had never heard of the game. This is why PoE2 used a
Kickstarter Fig campaign.
- What marketing did exist was misleading and failed to really capture the essence of the game
- The game was too off-the-wall, especially setting-wise; people couldn't go 'if you liked [x], play Tyranny', since it wasn't something that had been done before/
- The game was overpriced for the content included.
- Other games being released at the same time.
A lot of this comes down to Paradox's involvement. Paradox's marketing acumen is subpar, but that has been masked by their other advantages.