Kalashtar: am I missing something?

[Destil]

Also, the encounter power most races get, (Elven Accuracy, Halfling dodging, Warforged Resove, Hellish Rebuke, Fade Away, Dragon Breath, Shifting) will be useful in almost every encounter. Bastion of Mental Clarity is decidedly not so. Unless Attacks vs. Will become much more common at paragon, too, I have a hard time seeing how it stacks up.

No, telepathy is the key power. It's not encounter and it's not a purely combat power, but that's really what the Kalashatar get for a racial power. Bastion is more in line with the half-orc bonus to charge speed or the eladrin bonus to save vs. charm. It's a small bonus that shouldn't really be the main draw of the race.