you are completely off base with your opinion. having HS cost 2/3 of normal 50% of the time is an insane change. With the 2pc, during inner rage you will be able to do 3 HS's for the total cost of 2. this change has pretty massive implications on our itemization too, because because it's going to give incentive to maximizing HS's used, and therefore giving more incentive to hit/haste.
Assuming you use CS on cooldown, it currently has an uptime of 30% for a given 20second timeline. Now if you were to get a 4pc proc, the CS uptime for that 20 seconds jumps up to 60%, which is amazingly good. sure it's not going to make us do an extra 15000 dps when we get our 4pc, but it's very very good.
I would personally argue that this tier has the best combined set bonuses of any tier bonuses we have ever had. (meaning this tiers 2pc+4pc is worth more than any other tiers 2pc+4pc)