I assume this changes were made to balance the arena..

Changes wont affect my shamans much but it will indeed hurt my orc warrior! Wotf would only work against warlock and warrior fear anyway in WOTLK since the priest pshy scream turns into horror effect (well the 4 first seconds)

Perception was hit hard as well.. 1 stealth level isnt much tbh (the stealth enchant on cloack grants you 1 stleath level and the engineer head gear gives you 1 level higher stealth detection.)