I haven't played a single game with this faction since the expansion was released, not counting the "take to" matches. But when I encountered Haven players, they looked quite decent (although I mostly played on the Portal, which is also not the strongest faction).
The Sword is good, yes. I crafted two Mars and don't regret it; it's a great card. The only problem is with card draw; if the game goes into the late game, you need to add some Arthurs or something else.
And in general, I'm currently running a neutral deck. I initially made Sah for the Dragon, but it turns out I use it more in the forest. It's a fun deck, but it depends a lot on the draw.
Also, today I met a Russian nickname in the Ranked mode for the first time, and it was quite... original.
To sell my soul