I wouldn't agree with that. The actions are somewhat related, but it's impossible to say the Mini-14 should be reliable because the M1 Carbine is reliable. Not all AKs are equal. Not all DI AR15s are equal. Not all gas piston AR15s are equal. And, finally, not even all M1 Carbines are equal...the newer Auto-Ordnance repros are balls of suck (Kahr screws up something else, go figure).
The Mini-14 and 30 are carbines that I want to like.....I really want to like them...but I can't. If you could repair them without the need to return to the factory, and if they were reliable, I'd probably buy a Mini-30. The fact that the 30 doesn't like steel case ammo is just another big strike in the box against it. Who would want a 7.62x39 carbine that doesn't eat steel case ammo? Bleh.