I looked over the odds for ratings:
- Zero = 16.7% chance of 1 success
- 1 = 37% chance of 1 success
- 2 = 61% chance of at least 1 success (a "partial"), 14% chance of 2 successes (a "full")
- 3 = 76% of at least 1, 32% chance of 2
- 4 = 85%, 48%
- 5 = 90%, 61%
- Etc.
If you want characters to feel a bit more like experts at the start, then it would be good to allow them to take one or two aspects at 3, 4, or 5.