Uh, you'd get more than 5k crits while leveling. My first 5k+ crit was at 68, or 69 in questing gear. My first 10k+ crit was at 68 when I started doing instances. Sounds like PVP against a high resilience target in crap gear without Immolate/CoE up. That's about the only thing I could see bringing it down that low.