Darnold is a tier below Cam for certain in athletic ability and arm strength, but he's also tiers above Delhomme...
As to the stupid decisions, through 2 games, Darnold has an *extremely* low percentage of INTs thrown per pass. I don't think we can assume he'll play as poorly as he did with the Jets there.
Delhomme was a better decision maker than he was given credit for. He also liked to gamble beyond his ability. That comes with the territory.
I best decision making qb we ever had was Beurlin. I always thought he was a good qb but he couldn't carry the team. Not a lot can honestly.
It's easier to find the Beurlins then the Newtons unless your are constantly drafting in the top 3. If you want to be a perennial contender to better find your signal caller wherever you can and have a team around that can help him win and not expect him to carry the team.