This, so much this. Ring of Peace's only advantage over Leg Sweep is that you can cast it at range and pressure hunters and casters. Beyond that, 20 yard Paralysis and Leg Sweep is an absolutely devastating combination.
Frankly, the 20 yard (physical) Paralysis, the free ToK and Tiger Lust, the Trinket, the new mastery, and the improved level 30 talents have led to far more wins than Ring of Peace.