Damage: It's better then Louise's but worse then Wil's.
Critical: She averages 12, which can be bumped up to a 67 with most supports and a Killer Bow.
Speed: She's pretty fast. Considered to be a "speed demon" with an average of 28.
Dodge: She averages 79 dodge, which helps her a lot if an enemy gets close enough to hit her. Early on, make sure that you keep her behind a wall of units since neither her dodge nor her defense are good enough yet.
Growth Rates
HP - 60%
Strength - 40%
Skill - 50%
Speed - 60%
Defense - 15%
Resistence - 30%
Luck - 50%
Average Level 20 Sniper Rebecca
HP - 44
Strength - 22
Skill - 25
Speed - 28
Defense - 11
Resistence - 14
Luck - 23
Total - ?167
Supports
Dart - 16/27/27 turns
Wil - 17/27/27 turns
Louise - 27/27 turns
Nino - 27/27/27 turns
Lowen - 38/40/40 turns
Sain - 41/40/40 turns
Raven - 41/40/40 turns
Rating: 8.8/10. She's useful, she's better then Wil, but I still don't think she should be used in Hard Mode. Her stats are respectable but she is difficult to raise without Arena Abuse.
Fan Rating: N/A (E-mail me if you have a fan rating for Rebecca)