I think the problem is that MS requires setup to hit like a truck. I don't know shit about Pallys, but on my Outlaw Rogue, if I proc a double hit Sinister Strike and do a 5 combo Dispatch, I'm hitting for 14-17k. This can happen multiple times, back to back with no cooldown between (unlike MS where you get ur OP powered MS, and then you got to wait for OP and MS to reset to do it again), and all it really takes is to have 1 bones buff.
I've seen Sub Rogues do even more (they smoke me on trash in dungeons, and I'm hitting like a truck with cleave), but I haven't seen a single dagger this xpac so I have no idea what their numbers are like.