Reaper mobility, gap closers and defences (or lack there of) makes me wonder: is this elite really intended to be a melee class.
It surprizes me that Anet discribe a Reaper as a melee orientated elite while having light armour and nothing in terms of gap closers, escapes and hard defensives (like block, extra evades, invunerbity, etc). Not to mention Reaper is probably the slowest hitting Great Sword profession in the game, with very little pay off when actually landing an attack (especially when compared to for example ranger GS, reaper feels second best - which is odd to me considering ranger should be a ranged class!)
I would like to propse to Anet 3 simple changes that I feel would go a long way to making reapers a more melee orientated elite as intended:
First and foremost, reduce all reaper GS cast times by 50%. No explaination needed if you ever tried playing with it!
Secondly buff warhorn 5 "locust swarm" to gain +66% movement speed and the locust swam aura also adds weakness in addition to cripple. Increase life force gain to 2% and set the duration of both the speed and locust swarm aura to last 15 seconds on the 30 CD. This would work well for mobility as the speed and cripple would let you chase down enemy while also acting as an escape. Weakness would be an additional defence when you are in duels (as melee elites should be in!)
Finally "Death charge" and "Grasping darkness" have their range increased to 1200 to become proper gap closers.