I think we are undervaluing haste, but SimC overvalues haste because it is a robot and can play a perfect rotation against a non moving boss and doesnt use any cooldowns like TOK, Zenmed, or EH. One thing that I still want to do is create a SimC profile for MOP boss encounter, because none have any similarities to a Patchwerk, but I'm not a developer who knows C# and there is only so much you can do via the input interface. I think on average, I'm losing 2GCds/min to not being a robot just on a dummy, and in a real fight that is probably more.
I put a lot of time into my spreadsheet, and I think the first tab is good enough to play with for other monks. If you want to dig deeper, you can calibrate your rotation against SimC in the right hand tabs vs. a dummy and see where your haste breakpoints are:
https://docs.google.com/spreadsheet/...0TktDUEE#gid=6
Obviously it depends on your mastery, but I'm seeing a haste/crit breakpoint (for a meatbag) at around 16-20% haste where you TP cap (assuming you arent /cancelauraing them) and a BOK breakpoint at about 45-50% haste. I'll check out live tonight and see if Mihir's report on the TP change is now live; if not, this makes haste worth more compared to crit.
I also need to update my 5.2 spreadsheet and see how this all translates to the mastery change.
Edit: One thing I do notice with haste is that the diminishing returns get larger and larger the closer you get to the cap. Even with my imperfect rotation, I'm still doing about 98.5% of the DPS of the SimC model, mostly due to sitting on energy, and timing of RSK which makes me use chi on BOK instead. Our haste caps aren't as unforgiving as say a caster where they get an extra tick, or reach the GCD and all of a sudden the stat isnt worth much. It's more of a gradient.