...or are all the Space Wolf psychic powers absolutely terrible? Fury of the Wolf Spirits is cool, but it requires rank 5, so it's unattainable for a long time, and the rest of them are complete ****.
Living Lightning (a confusing, badly written power) and Tempest's Wrath are the worst because you have to be outside on a planet with an atmosphere, and how often does that happen in the scope of a typical Deathwatch mission? When is the kill team not going to be in a ship, on a space station, in an enemy fortress, in a cave, etc.? Why would I pay 1000 xp for a power I can only use 1/10 of the time, and practically never in a boss fight (what kind of end boss is just sitting around outside?).
Storm Caller and Thunderclap suck because they negatively effect your Kill-team. Even a Rank 1 Librarian casting a fettered Storm Caller will make all of his friends within 10 meters at -10 to BS. As ranged attacks are the main source of damage in Deathwatch, especially early on before people have access to good melee weaponry, this is a huge disadvantage to teams trying to stay in squad distance. Thunderclap hits friends, doesn't do enough damage to matter vs. enemies on their own, and does just as much damage as any number of other powers vs. hordes. It might be okay if you're facing 3+ different hordes at once, but how often is that going to happen? At least these two powers are cheap for how bad they are.
For how much fun Space Wolf Rune Priests are in 40k, these powers are a huge letdown.