My ordinary default is to never make reaction rolls; reaction bonuses apply to influence skills, and that's really all they do. However, if I were using them I'd probably go with something like:
- 0 or lower: Very Bad. Disastrous results do not occur randomly.
- 1-4: Bad
- 5-8: Poor
- 9-12: Neutral
- 13-16: Good
- 17+: Very Good. Excellent results do not occur randomly.