The Shatterer does deserve a buff and so does the Claw of Jormag
Tbh Teq was the least intimidating dragon champion in terms of appearance and look all the power he got, and the rewards are very good, The Shatterer could get some unique mechanics using his flight and the mortars close to the spawn area, also it would be nice to get Branded themed weapons.
The Claw of Jormag is mainly disliked because it spams knockback and fear, “spam” is not an exaggeration and considering this boss has 2 phases, a cannon and the bazooka weapons nearby, ANet could come with some crafty things for this fight.
I know this is all easier said than done, these are just my views on the subject.