Personally, I think where this whole thing gets out of hand is approaching the game with the idea that a power that doesn't deal enough damage to add to an attack chain is "useless".
Taking Screech as my example here. I used to play a Sonic/Devices blaster on live and got a TON of use out of Screech when I soloed. I'd stealth up and put a group to sleep with Siren's Song. Then I'd wake up a LT with Screech...who was now stunned and unable to attack me. And wash rinse repeat of the whole cycle. I would frequently go entire missions without even being attacked, let alone damaged.
Point being, there is a place in the game for low damage mez powers in offense sets. Most of those sets deal plenty of damage and aren't really being hurt by having 1 power in them that doesn't do much, but does do something else.
If I recall correctly, the original intent of the low damage mez powers was to give blasters a means to deal with enemies who mez by mezzing them first.
