Tank Stats!?

[Bourne_Endeavor]

Always meld STR in the guaranteed slot. Afterwards, it depends on which tank. Warrior prioritizes Crit and Det due to the recent changes to Inner Release. Dark Knight, honestly, doesn't care one way or another while Paladin prefers Direct Hit > Crit. If you intend to rotate all three tanks, focus on Crit > Det/Direct hit. Paladin only loses a small amount switching between Direct Hit and Crit whereas Warrior suffers far more noticeably.

As for Tenacity. Ignore it completely for melding purposes. While decent on gear itself, especially during prog. There will never be a scenario where Tenacity benefits you enough to warrant melding. This may change come 4.4, however as it stands currently, you don't meld Tenacity.