Luck does need to bring down the INT's, but it happens, and he still has a very bright future.
Comparisons between Luck, and Griffin right now are rather pointless. Both had immediate success, but only one is getting a new head coach in just his third season. Continuity is huge for a young QB, time will tell if Griffin can get back to where he started. He's got the talent.
Talent was never an issue.
The big question mark with Griffin was, and still is, durability.