With all due respect (something lacking on the internet), I disagree. Germination will waste a tremendous amount of GCDs and a load of mana. On the other hand, tranquil mind effectively transforms tranquility into a mana saving CD, not only a lifesaver. Loads of fights DO NOT have spike raid damage which will instantly endanger people, but being able to top everyone off with 40k mana is huge. Makes tranquility almost part of the "rotation".
I do see your point, and perhaps we are discussing apples Vs oranges here. In my raid comp, there's no point running germination because I will waste all my mana, GCD's, and half of that healing will go to waste. But perhaps the healers in your comp are not as good? Or are you running 1 healer less than the norm, and you have tremendous DPS that can finish the fights early?
Would love to see your logs too!
Cheers
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Cenarius is exactly the style of fight where Tranquil Mind is ideal. You have one CD up for every damage heavy phase (Ghanir/Flourish and Tranq).
Cheers
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Additionally, speaking for myself, I run mostly with haste, then Crit, then all the Mastery I can get. If I recall correctly (not at my pc right now) I am at around 28% haste, 24% crit, and around 12% mastery or so in raids. For M+ i trade some crit and haste for Mastery, but overall haste and crit still win.