Mike Vick, six years into his career (going into the dogfighting arrest) had a 71/52 TD/INT ratio, for a 75.7 QB rating.
RG3, three years in, had a 40/23 TD/INT ratio, for a 90.6 QB rating. He then got hurt and was never the same again.
Lamar, three years in, has a 68/18 TD/INT ratio, for a 102.6 QB rating.
Lamar is head and shoulders above both of those players.