Well, the theme they seem to be pushing this expansion is, "party synergy." We can draw that from Yoshi-Ps comments about DRG as well as all of the skills others classes got that contribute to the party in some way or another. Brotherhood in theory is good, but not affecting the MNK makes it a useless skill outside playing with others and I feel like the Lv70 MNK skill shouldn't be solely for grouped content.

Tornado Kick is 100% more viable now when you line-up Riddle of Fire and Internal Release and then immediately re-apply a stack of Greased Lightning afterwards.

Deep Meditation is a good trait building on the Chakra system, but when I found out only weaponskills had the potential to give Chakras and not abilities, (Like Steel Peak, Elixir Field), I found it be a little more lacking. But, it does give MNK a chance to actually build Chakra while in combat, rather than in transitions or having to move away from the enemy for whatever reason.