Curious to hear what others have to say about Hem and Leap. My Sav/Will Brute is an absolute riot to play but haven't leveled to those powers yet. I, personally, very much enjoy teleportAoEs, so I'll definitely be taking Leap. Spring Attack is fun and all, but doesn't seem to do much damage unless I'm at full Fury (ymmv, might be better on a scrappy), so I might respec out of it later since Savage Leap looks to have a decent recharge time negating the need for two similar powers. Of course fun factor might override that, and on the Brute version another AoE is always welcome.
As far as Exhaustion, I've taken letting BF stack to full, dropping RF, then hitting Blood Thirst to get the stacks of Blood Fury back immediately. Sort of opposite of Build Up. This helps keep the end discount and +rech moving along. Rending Flurry's radius is positively massive when the stacks are full.
If you're habitually using Blood Thirst like a traditional Build Up, then I'd suggest trying it immediately after spending the BF Stacks and see if that works out better.
Agreed that the set lacks a single "marquee" hard-hitting attack, but play-style wise it seems so far to be about rapid damage than damage all at once. In that respect, not sure it needs one.