Just yesterday I added Sirens to my guide, you might want to check it out
As to my opinion on Sirens…
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The fact that they don’t need LOS to initiate MC is certainly annoying. However, they don’t get to move the soldier under MC until the next turn, while the player’s Priests get to do it on the same turn. So personally I don’t mind that they get to do MC without LOS - it’s more than a fair tradeoff, IMO.
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I don’t think there is any Lore to support that MC should be more WP expensive over longer distances. Also, using formulas makes prediciting the outcome of player’s decisions harder. Right now it’s easy to understand if the Siren will keep MC, or not, and what has to be done to end it. This, IMO, is the most important, and the biggest advantage of MC mechanics in PP vs other games.
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Another possibility would be to make Siren’s MC have the same cost as the player’s (that is, the WP of the soldier at the start of the turn). However, this could also work against the player, as killing Pandas would reduce the cost of MCing the soldier for the Siren.