As I said in my previous post, this game is hilariously unbalanced. It's really hard to win the economy game against the Clans or the Broken Lords; you can't have a better early game than the Wild Walkers, and don't even consider trying to beat the Vaulters in the late-game (Seriously, you either kill them early, or they will out-everything you once Winter comes). Being unbalanced doesn't mean it's bad, though (unless you play multiplayer). A lot of classic fantasy 4x's were unbalanced as hell, but they are still widely regarded today (hence why they're classics).
As Aklyon said, it's pretty much impossible to have really unique factions in a 4x, while still maintaining balance (hell, it's hard to have slightly unique factions and still be balanced). Personally, if I had to choose between balanced and dull factions, or unique and hilariously unbalanced factions, I'd choose the unique factions every time. I don't play multiplayer, though, so that's an easy choice. I haven't tried the multiplayer, but I can imagine it's a pain.
The problem is that the AI is not really challenging. Hell, in my first game as the Vaulters (favorite faction ATM) I almost won an elimination victory against 7 factions without destroying any civs (I did take some cities from the Draken and the Necrophages, though). The neutral villages were killing them for me. In the end, there was only a single city left (cultists), and I was getting worried, that I wouldn't get to see the wonder victory. They are also complete pushovers in the military, and I often found myself rolling through all of their cities without a problem (except happiness). This was on Normal.
If they can improve the AI, though, I will play this until Winter comes.