For the OP, a good melee build is 100% needed to do Reapers beyond R3, possibly even R1 depending on the amount of reaper points your party has gathered.
I'm doing a round of R10s at level 29+ each life now and can tell you that each PUG that I join that does not have a melee with high ac, prr, mrr and hp it's going to be a painful experience for that night.
Other than that, the devs should never have altered the stacking of crit range rand crit multipliers for weapons.
If they left that alone a melee would do the same damage numbers at endgame.
That said, there are still some two hander axe builds out there that can come close.
That said, get a SoS and possibly an Epic-SoS.